Updated on 2025/12/11

写真a

 
ISHIDA Takuya
 
Organization
Institute for Promotion of Research Center for Optical Research and Education Associate Professor
Title
Associate Professor

Degree

  • Ph.D ( 2016.3   Kyushu University )

Research Interests

  • Nanophotonics

  • Chirality

  • 磁性

  • ナノ構造制御

  • 光電気化学

  • メタマテリアル

Research Areas

  • Nanotechnology/Materials / Nanostructural physics

  • Nanotechnology/Materials / Nanometer-scale chemistry

  • Nanotechnology/Materials / Functional solid state chemistry

  • Nanotechnology/Materials / Nanomaterials

Education

  • Kyushu University   大学院工学府   材料物性工学専攻

    2013.4 - 2016.3

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    Country： Japan

    Notes： 博士課程、応用化学部門分子コース 山田研究室

  • Kagoshima University   Graduate School of Science and Engineering   Chemistry and Bioscience Course

    2011.4 - 2013.3

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    Country： Japan

    Notes： 修士課程、分子機化学講座 藏脇研究室

  • Kagoshima University   理学部   生命化学科

    2007.4 - 2011.3

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    Country： Japan

    Notes： 分子機化学講座 藏脇研究室

Research History

  • Utsunomiya University   Center for Optical Research and Education   Associate Professor

    2025.10 - Present

  • 国立研究開発法人科学技術振興機構 さきがけ研究者（兼任）   さきがけ研究者

    2024.10 - Present

  • The University of Tokyo   Institute of Industrial Science   Assistant Professor

    2022.7 - 2025.9

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    Notes：物質・環境系部門 立間研究室

  • The University of Tokyo   Institute of Industrial Science

    2019.1 - 2022.6

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    Notes：物質・環境系部門 立間研究室

  • The University of Tokyo   Institute of Industrial Science

    2016.4 - 2018.12

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    Notes：物質・環境系部門 立間研究室

  • Japan Society for the Promotion of Science   Special researcher of the Japan Society for the Promotion of Science

    2013.4 - 2016.3

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Professional Memberships

  • 日本磁気学会

    2024.6 - Present

  • 電気化学会

    2022.12 - Present

  • 応用物理学会

    2017.1 - Present

  • 日本化学会

    2013.12 - Present

  • 光化学協会

    2011.7 - Present

 

Papers

  • Symmetry Breaking and Chiral Shaping of Au Nanodisks by Plasmon-Induced Ag Deposition under Circularly Polarized Light Reviewed

    Yuri KAMEOKA,Takuya ISHIDA,Seung Hyuk LEE,Tetsu TATSUMA

    Electrochemistry   93 ( 9 )   94006 - 94006   2025.9

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    Publishing type：Research paper (scientific journal)   Publisher：The Electrochemical Society of Japan  

    DOI： 10.5796/electrochemistry.25-72052

  • Selective Enhancement of the Optical Chirality and Spin Angular Momentum in Plasmonic Near-Fields Reviewed

    Naoki Ichiji,Takuya Ishida,Ikki Morichika,Daigo Oue,Tetsu Tatsuma,Satoshi Ashihara

    Nano Lett.   25 ( 33 )   12578 - 12584   2025.8

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    Publishing type：Research paper (scientific journal)   Publisher：American Chemical Society (ACS)  

    DOI： 10.1021/acs.nanolett.5c02776

  • Designing Rotational Motion of Charge Densities on Plasmonic Nanostructures Excited by Circularly Polarized Light Reviewed

    Naoki Ichiji,Takuya Ishida,Ikki Morichika,Daigo Oue,Tetsu Tatsuma,Satoshi Ashihara

    Nanophotonics   13 ( 26 )   4751 - 4760   2024.12

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1515/nanoph-2024-0433

  • Magneto-Optical Properties of Superparamagnetic CoPt Alloy Nanoparticles in the UV–Visible Range Reviewed

    Chen Zhang,Takuya Ishida,Seung Hyuk Lee,Tetsu Tatsuma

    Appl. Phys. Lett.   124 ( 26 )   262404   2024.6

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    Authorship：Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：AIP Publishing  

    Superparamagnetic CoPt alloy nanoparticles were synthesized via a wet chemical method and exhibited intense magnetic circular dichroism (MCD) in the UV–visible range. The dissymmetry factor of MCD, gMCD, for the CoPt nanoparticles was 0.034 at room temperature in a magnetic field of ±1.6 T. The MCD responses may be due to plasmonic circular currents generated in the metallic CoPt nanoparticles by circularly polarized light. The responses were higher than those of the Co nanoparticles, likely due to the chemical stability and spin–orbit coupling.

    DOI： 10.1063/5.0211367

  • Effects of Plasmon Coupling on Circular Dichroism of Chiral Nanoparticle Arrays Invited Reviewed

    Shuki Kuroki,Takuya Ishida,Tetsu Tatsuma

    J. Chem. Phys.   160 ( 6 )   64702   2024.2

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    Authorship：Lead author   Publishing type：Research paper (scientific journal)   Publisher：AIP Publishing  

    Arrays and ensembles of chiral nanostructures have potential applications in the field of enantioselective sensors, metamaterials, and metasurfaces. In particular, chiral nanostructures fabricated through chemical and bottom-up approaches have attracted much attention from the viewpoint of cost and scalability, but the heterogeneity of the unit nanostructure constituting the array or ensemble often deteriorates its chiroptical responses. Here, we report that their deteriorated responses can be recovered or even enhanced further by interparticle plasmon coupling. We employed chiral silver (Ag) hexamers as models for electromagnetic simulations and investigated the effect of their parameters, such as interparticle spacing, chiral purity, and enantiomeric excess, on their g-factor, which is an index for chiroptical responses. The maximum value of g-factor (gmax) of the Ag hexamer surpasses that of the chiral monomer and augments with decreasing interparticle spacing. This enhancement in g-factor is observed even when chiral purity and enantiomeric excess are less than 100%, showing the potent role of plasmon coupling in amplifying chiroptical responses. Furthermore, our research highlights the amplification of the effect of plasmon coupling on the gmax value of infinite periodic chiral nanostructures. These results corroborate the potential of plasmon coupling to improve chiroptical responses by precisely controlling the interparticle spacing of chiral plasmonic nanostructures, thus mitigating the loss of g-factor caused by low purity and enantiomeric excess of the nanostructures fabricated by chemical and bottom-up approaches.

    DOI： 10.1063/5.0185286

  • Magneto-Plasmonic Response Enhancement of Au@Fe<sub>2</sub>O<sub>3</sub> Nanocomposites Fabricated by Plasmon-Induced Charge Separation Invited Reviewed

    Takuya Ishida,Rui-Zhuo Sun,Seung Hyuk Lee,Tetsu Tatsuma

    J. Phys. Chem. C   128 ( 6 )   2561 - 2566   2024.2

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    Authorship：Lead author,　Corresponding author   Publishing type：Research paper (scientific journal)   Publisher：American Chemical Society (ACS)  

    DOI： 10.1021/acs.jpcc.3c07566

  • Rotationally Displaced Electric Field Intensity Distribution Around Square Nanoantennas Induced by Circularly Polarized Light Reviewed

    Naoki Ichiji,Takuya Ishida,Ikki Morichika,Tetsu Tatsuma,Satoshi Ashihara

    Phys. Rev. B   109 ( 3 )   35428   2024.1

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1103/PhysRevB.109.035428

  • All-Plasmonic-Metal Chiral Nanostructures Fabricated by Circularly Polarized Light Reviewed

    Takuya Ishida,Akitoshi Isawa,Shuki Kuroki,Yuri Kameoka,Tetsu Tatsuma

    Appl. Phys. Lett.   123 ( 6 )   61111   2023.8

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    Authorship：Lead author   Publishing type：Research paper (scientific journal)   Publisher：AIP Publishing  

    Chiral plasmonic nanostructures, which would be applied to enantioselective sensors and metasurfaces, can be prepared in an enantioselective manner by irradiation with circularly polarized light (CPL). However, their resonance sites have been covered with non-plasmonic, dielectric moieties. Here, we prepared all-silver chiral plasmonic nanostructures on a glass plate in one-step by irradiating 380–450 nm right- or left-CPL to an aqueous solution containing Ag+ and citrate ions. Achiral or racemic Ag nanoparticles with anisotropic geometry are deposited on a glass plate by photochemical electron transfer from citrate to Ag+ in the initial phase. The deposited nanoparticles are grown into chiral structures under CPL via generation of an electric field with chiral distributions. An achiral Ag nanoplate array was also grown under 600–700 nm CPL into chiral nanostructure arrays on the basis of hot electron reduction of Ag+.

    DOI： 10.1063/5.0155834

  • Photofabrication of Chiral Plasmonic Nanostructure Arrays Reviewed

    Toru Homma,Naoki Sawada,Takuya Ishida,Tetsu Tatsuma

    ChemNanoMat   9 ( 7 )   e202300096   2023.5

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    Publishing type：Research paper (scientific journal)   Publisher：Wiley  

    DOI： 10.1002/cnma.202300096

  • Photofabrication of Chiral Plasmonic Nanospiroids Reviewed

    Koki Shimomura,Yuma Nakane,Takuya Ishida,Tetsu Tatsuma

    Appl. Phys. Lett.   122 ( 15 )   151109   2023.4

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    Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：AIP Publishing  

    Nanofabrication of three-dimensional chiral plasmonic structures has been a challenging research topic. In the present study, we shaped dielectric caps on plasmonic gold nanocubes (AuNCs) into three-dimensional nanospiroids by circularly polarized light (CPL) as the chirality source, without using lithographic methods or chiral molecules. AuNCs adsorbed on a TiO<sub>2</sub> substrate were irradiated with right or left CPL in the presence of Pb<sup>2+</sup> for the deposition of PbO<sub>2</sub> on AuNCs. The Au–PbO<sub>2</sub> nanocomposites, thus, obtained are the first spiral plasmonic nanostructures prepared by CPL. They exhibit strong and sharp signals of circular dichroism, and the signs of the signals are reversed by changing the rotation direction of the CPL used. Their g-factor values are highest among the chiral plasmonic nanostructures fabricated by CPL.

    DOI： 10.1063/5.0146579

  • One-Step Electrodeposition of Chiral Plasmonic Gold Nanostructures for Enantioselective Sensing Reviewed

    Igseon Gu,Takuya Ishida,Tetsu Tatsuma

    Electrochemistry   90 ( 7 )   77006   2022.7

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    Publishing type：Research paper (scientific journal)   Publisher：The Electrochemical Society of Japan  

    DOI： 10.5796/electrochemistry.22-00046

  • Plasmon-Induced Photocatalysis Based on Pt-Au Coupling with Enhanced Oxidation Abilities Reviewed

    Yukika Aoki,Takuya Ishida,Tetsu Tatsuma

    ACS Appl. Nano Mater.   5 ( 3 )   4406 - 4412   2022.3

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    Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1021/acsanm.2c00509

  • A Versatile Method for Surface Functionalization and Hydrophobization of Gold Nanoparticles Reviewed

    Takuya Ishida,Yohei Yanaga,Sunao Yamada,Yukina Takahashi

    Appl. Surf. Sci.   546   148932   2021.4

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    Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.apsusc.2021.148932

  • Visualization of Nano-Localized and Delocalized Oxidation Sites for Plasmon-Induced Charge Separation Reviewed

    Rui Ogata,Hiroyasu Nishi,Takuya Ishida,Tetsu Tatsuma

    Nanoscale   13 ( 2 )   681 - 684   2021.1

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1039/d0nr08552a

  • Plasmon-Induced Charge Separation Through Asymmetric Plasmon Coupling Reviewed

    Takuya Ishida,Tetsu Tatsuma

    J. Phys. Chem. C   124 ( 42 )   23454 - 23459   2020.10

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    Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1021/acs.jpcc.0c07267

  • Photoinduced Chirality Switching of Metal-Inorganic Plasmonic Nanostructures Reviewed

    Kazeto Morisawa,Takuya Ishida,Tetsu Tatsuma

    ACS Nano   14 ( 3 )   3603 - 3609   2020.3

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1021/acsnano.9b10216

  • Oxidative Reaction Energy in Photopolymerization Inspired by Plasmon-Induced Charge Separation Reviewed

    Yukina Takahashi,Yusuke Sota,Takuya Ishida,Yoshitaka Furukawa,Sunao Yamada

    J. Phys. Chem. C   124 ( 7 )   4202 - 4205   2020.2

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1021/acs.jpcc.9b09738

  • Stepwise Injection of Energetic Electrons and Holes in Plasmon-Induced Charge Separation Reviewed

    Takuya Ishida,Shino Toe,Tetsu Tatsuma

    J. Phys. Chem. C   123 ( 50 )   30562 - 30570   2019.12

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    Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1021/acs.jpcc.9b08923

  • Effect of Plasmon Coupling on Quantum Efficiencies of Plasmon-Induced Charge Separation Reviewed

    Takuya Ishida,Tetsu Tatsuma

    J. Phys. Chem. C   122 ( 45 )   26153 - 26159   2018.11

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    Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1021/acs.jpcc.8b07986

  • Plasmonic-Diffractive Hybrid Sensors Based on a Gold Nanoprism Array Reviewed

    Kazutaka Akiyoshi,Yoshito Y. Tanaka,Takuya Ishida,Tsutomu Shimura,Tetsu Tatsuma

    ACS Appl. Nano Mater.   1 ( 11 )   5994 - 5999   2018.11

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1021/acsanm.8b01829

  • Space Optimization for Utilization of Plasmonic Effect on a P3HT-Gold Nanoparticle Photoelectrode Reviewed

    Takuya Ishida,Miho Katagishi,Yukina Takahashi,Sunao Yamada

    Chem. Lett.   46 ( 11 )   1612 - 1615   2017.11

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    Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1246/cl.170707

  • Plasmon-Induced Charge Separation: Chemistry and Wide Applications Invited Reviewed

    Tetsu Tatsuma,Hiroyasu Nishi,Takuya Ishida

    Chem. Sci.   8 ( 5 )   3325 - 3337   2017.5

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1039/c7sc00031f

  • Structural Characterization and Plasmonic Properties of Two-Dimensional Arrays of Hydrophobic Large Gold Nanoparticles Fabricated by Langmuir-Blodgett Technique Reviewed

    Takuya Ishida,Yuki Tachikiri,Takayuki Sako,Yukina Takahashi,Sunao Yamada

    Appl. Surf. Sci.   404   350 - 356   2017.5

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    Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.apsusc.2017.01.304

  • Site-selective Nanoscale-polymerization of Pyrrole on Gold Nanoparticles via Plasmon Induced Charge Separation Reviewed

    Y. Takahashi,Y. Furukawa,T. Ishida,S. Yamada

    Nanoscale   8 ( 16 )   8520 - 8524   2016.4

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Royal Society of Chemistry (RSC)  

    DOI： 10.1039/c6nr01531j

  • Thermal and Chemical Stabilization of Silver Nanoplates for Plasmonic Sensor Application Reviewed

    Yukina Takahashi,Koichi Suga,Takuya Ishida,Sunao Yamada

    Anal. Sci.   32 ( 3 )   275 - 279   2016.3

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.2116/analsci.32.275

  • Vibrational Spectroscopic Studies on the Formation Processes and Characteristics of Octadecanethiol Monolayers on the Surfaces of Gold Nanoparticles Reviewed

    Takuya Ishida,Yuki Tachikiri,Yukina Takahashi,Junichi Kurawaki,Sunao Yamada

    Transactions of the Materials Research Society of Japan   40 ( 3 )   253 - 256   2015.4

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    Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：The Materials Research Society of Japan  

    DOI： 10.14723/tmrsj.40.253

  • Vibrational Spectroscopic Characterization of 4-acylamidobenzenethiol-stabilized Gold Nanoparticles Reviewed

    Takuya Ishida,Yukina Takahashi,Hiroaki Okamura,Junichi Kurawaki,Sunao Yamada

    Vibrational Spectroscopy   73   10 - 14   2014.7

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    Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

    DOI： 10.1016/j.vibspec.2014.04.002

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MISC

  • 円偏光励起によるプラズモニックナノ構造上の電荷の回転運動制御

    伊知地直樹,石田拓也,大上能悟,森近一貴,立間徹,芦原聡

    フォトニクスニュース   10 ( 2 )   53 - 53   2024.12

  • Synthesis and Characterization of Superparamagnetic CoPt Alloy Nanoparticles Exhibiting Magneto-Plasmonic Responses

    Chen Zhang,Takuya Ishida,Seung Hyuk Lee,Tetsu Tatsuma

    ECS Meeting Abstracts   MA2024-02 ( 67 )   4595 - 4595   2024.11

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    Publisher：The Electrochemical Society  

    Magnetic materials containing transition metals such as Fe, Co, and Ni have attracted considerable interest, in particular for their unique properties, which allow them to be applied to devices for magnetic control of optical communications and magneto-optical data storage. Magnetic control of catalysis and electrocatalysis is also a potential application of magnetic materials. Apparent catalytic activity can be controlled via a magnetohydrodynamic (MHD) effect, which affect mass transport rate in the vicinity of the magnetic material.<sup>[1]</sup> In addition, enantioselectivity can be given to the system by taking advantage of chiral-induced spin selectivity (CISS), which can be induced by magnetic materials.<sup>[2]</sup> If a magnetic material is broken down into nanoparticles, they could also obtain high catalytic activities. In addition, they would be superparamagnetic materials, which respond very rapidly to external magnetic fields without hysteresis. If the magnetic nanoparticles are metallic, they might exhibit magneto-optical responses such as magnetic circular dichroism (MCD), in association with localized surface plasmon resonance (LSPR).<sup>[3]</sup> LSPR would also allow the nanoparticles to be used for photocatalysis based on plasmon-induced charge separation (PICS).<sup>[4]</sup> These characteristics render magnetic nanomaterials suitable for catalysis, electrocatalysis, and photoelectrocatalysis with controllable activity and selectivity.

    With these points in mind, we synthesize superparamagnetic CoPt nanoparticles through a convenient wet chemical process<sup>[5]</sup> and examine their magneto-optical properties, more specifically, magnetic circular dichroism (MCD), in the UV-visible range. MCD characteristics would be important indices for magnetic materials to assess their magnetic properties including CISS. CoPt nanoparticles are well known for their high electrocatalytic activities as well as high magnetism due to strong spin-orbit interaction.<sup>[6]</sup> CoPt superlattice nanoparticles has been reported to show MCD in the near-infrared range and applied to magnetic switching of plasmonic laser.<sup>[7]</sup> However, MCD in the UV-visible range has not yet been reported for CoPt materials to the best of our knowledge.

    Co, Pt, and CoPt nanoparticles were synthesized via an oleylamine co-reduction method. Scanning electron microscopy (SEM) image shows that CoPt nanoparticles have a spherical shape with an average size of 6 nm (Fig. 1a). On the basis of X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and superconducting quantum interference device (SQUID) analyses, we have confirmed that the synthesized CoPt nanoparticles have face-centered cubic (fcc) structure with a small amount of cobalt oxides at the particle surface of CoPt, and show superparamagnetism at room temperature.

    The magneto-optical properties of the Co, Pt, and CoPt nanoparticles were evaluated by a dissymmetry factor, g <sub>MCD</sub>-factor which was obtained by normalizing MCD with extinction. As shown in Fig. 1b, the Pt nanoparticles showed almost no MCD responses, and the Co nanoparticles exhibited very weak MCD responses, although the latter are magnetic. In contrast, the CoPt nanoparticles showed sufficiently strong MCD signals over the UV-visible range examined. The value of their g <sub>MCD</sub>-factor was approximately 0.034, which was in the range of very high g <sub>MCD</sub>-factor values.

    The possible origin of the MCD properties is circular electron motion in the metallic nanoparticle induced by circularly polarized light. It could also be coupled with circular mode of LSPR. In an external magnetic field, a Lorentz force is applied to the rotating charges, and the resonant light energy depends on the direction of the rotation, resulting in lifted degeneracy (Fig. 1c). Although this type of MCD is also observed for non-magnetic Au nanoparticles, introduction of a magnetic component to the nanosystem enhances the local magnetic field and thereby MCD responses. Likewise, the magnetism of Co would be positive for the MCD responses in the present system. In addition, the spin-orbit coupling induced by Pt may enhance the MCD responses further.

    [1] S. Luo, K. Elouarzaki, and Z. J. Xu, Angew. Chem. Int. Ed. 61, e202203564 (2022).

    [2] B. Göhler, V. Hamelbeck, T. Z. Markus, M. Kettner, G. F. Hanne, Z. Vager, R. Naaman, and H. Zacharias, Science 331, 894 (2011).

    [3] F. Pineider, G. Campo, V. Bonanni, C. d. J. Fernández, G. Mattei, A. Caneschi, D. Gatteschi, and C. Sangregorio, Nano Lett. 13, 4785 (2013).

    [4] Y. Tian and T. Tatsuma, J. Am. Chem. Soc. 127, 7632 (2005).

    [5] Y. Yu, W. Yang, X. Sun, W. Zhu, X.-Z. Li, D. J. Sellmyer, and S. Sun, Nano Lett. 14, 5, 2778 (2014).

    [6] J. Okabayashi, Y. Miura, and H. Munekata, Sci. Rep. 8, 8303 (2018).

    [7] F. Freire-Fernández, J. Cuerda, K. S. Daskalakis, S. Perumbilavil, J.-P. Martikainen, K. Arjas, P. Törmä, and S. van Dijken, Nat. Photon. 16, 27 (2022).



    Figure 1

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    DOI： 10.1149/ma2024-02674595mtgabs

    Other Link： https://iopscience.iop.org/article/10.1149/MA2024-02674595mtgabs/pdf

  • Plasmonic Fabrication of Chiral and Magneto-Chiral Nanostructures

    Tetsu Tatsuma,Takuya Ishida

    ECS Meeting Abstracts   MA2024-02 ( 59 )   3970 - 3970   2024.11

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    Publisher：The Electrochemical Society  

    Chiral and magneto-chiral plasmonic nanostructures attract attention because they have various potential applications including catalysts, chemical sensors, and optical and optoelectronic materials and devices. In many cases, those nanostructures are fabricated by lithographic techniques. However, those top down methods are generally time-consuming and expensive. Therefore, we have developed photoelectrochemical methods in which site-selective deposition or dissolution reactions are driven by optical near field generated around anisotropic metal nanoparticles under right- or left-circularly polarized light (CPL).

    We have used gold or silver nanocuboids,<sup>1</sup> nanorods,<sup>2</sup> nanocubes,<sup>3</sup> triangular nanoplates,<sup>4</sup> and intricate nanoporous films<sup>5</sup> on semiconducting or dielectric substrates as anisotropic metal precursors for preparation of chiral plasmonic nanostructures. If an anisotropic metal nanoparticle is irradiated with CPL, chiral electric field is generated around the nanoparticle, and energetic electron-hole pairs generate at the resonance sites, where electric field is localized. As a result, reductive deposition of silver or oxidative deposition of lead oxide proceeds preferentially at the resonance sites, resulting in formation of chiral plasmonic nanostructures, which exhibit circular dichroism (CD).

    Chiral metal nanoparticles were also prepared from less anisotropic, circular metal nanodisks. In this case, initial nucleation of metal at an arbitrary site of the nanodisk edge breaks its symmetry and gives rise to chiral electric field distributions under CPL. As a result, the nanodisk is grown into chiral plasmonic nanostructure.

    We also prepared magneto-chiral nanostructures by employing superparamagnetic magnetite nanocubes as precursors. The magnetite nanocubes on a glass substrate exhibit magnetic circular dichroism (MCD) but not CD. Magnetite is also reported to be conducting enough for its nanoparticles to show LSPR. Therefore, chiral electric field generates at around a magnetite nanocube under CPL and plasmonic photoelectrochemical reactions can proceed at those localized resonance sites. In addition, magnetite also has valence band and conduction band, and an electron in the valence band can be excited to the conduction band by a photon with energy higher than the band-gap energy. This photoexcitation can also occur at the localized resonance sites.<sup>6</sup> As a result of those localized photoelectrochemical reactions induced by CPL, chiral magnetite-silver nanocomposite structures were obtained, and those nanocomposites not only MCD but also CD based on the chiral morphologies. Thus, the nanocomposites break both inversion and time-reversal symmetries. As a result, they exhibit nonreciprocal transmission of visible light, which is recognized also as magneto-chiral dichroism (MChD). K. Saito and T. Tatsuma, Nano Lett. 18, 3209-3212 (2018).

    K. Morisawa, T. Ishida, and T. Tatsuma, ACS Nano 14, 3603-3609 (2020).

    K. Shimomura, Y. Nakane, T. Ishida, and T. Tatsuma, Appl. Phys. Lett. 122, 151109 (2023).

    T. Ishida, A. Isawa, S. Kuroki, Y. Kameoka, and T. Tatsuma, Appl. Phys. Lett. 123, 061111 (2023).

    H. Nishi, T. Tojo, and T. Tatsuma, Electrochemistry in press (doi: 10.5796/electrochemistry.24-00027).

    Y. Oba, S. H. Lee, and T. Tatsuma, J. Phys. Chem. C 128, 827-831 (2024).





    Figure 1

    <p></p>

    DOI： 10.1149/ma2024-02593970mtgabs

    Other Link： https://iopscience.iop.org/article/10.1149/MA2024-02593970mtgabs/pdf

  • ［水素感応磁性層／プラズモン励起層］積層膜による磁気光学式水素ガスセンサ

    山根治起,柴田寿人,石田拓也,立間 徹

    電気学会 第41回「センサ・マイクロマシンと応用システム」シンポジウム講演論文集   41   26P2-C-6   2024.11

  • Rotationally displaced intensity distribution around square nano-plates excited by circularly polarized light Reviewed

    Naoki Ichiji,Takuya Ishida,Ikki Morichika,Tetsu Tatsuma,Satoshi Ashihara

    CLEO 2024   JTh2A.122 - JTh2A.122   2024.9

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    Publisher：Optica Publishing Group  

    The rotationally displaced intensity distribution of electric fields around the nano-square plasmonic plate under circular polarization is revealed to arise from the superposition of multiple plasmon modes, not solely the fundamental mode.

    DOI： 10.1364/cleo_at.2024.jth2a.122

  • Plasmonic Nanofabrication of Chiral Nanodisk Ensembles

    Tetsu Tatsuma,Takuya Ishida,Yuri Kameoka

    ECS Meeting Abstracts   MA2024-01 ( 13 )   1099 - 1099   2024.8

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    Publisher：The Electrochemical Society  

    Chiral plasmonic nanostructures attract attention because those could be applied to enantioselective chemical sensors, optical isolators, light sources for circularly polarized light (CPL), metasurfaces, and metamaterials. In many cases, chiral plasmonic nanostructures are fabricated by a top-down method such as electron beam lithography (EBL). Since EBL is time-consuming and expensive, we have developed photoelectrochemical methods in which a site-selective reaction is driven by optical near field generated around anisotropic metal nanoparticles under right- or left-CPL. As anisotropic metal precursors for preparation of chiral nanoparticles, we have used gold or silver nanocuboids, nanorods, nanocubes, and triangular or hexagonal nanoplates so far.<sup>1-5</sup> In the present work we demonstrate that laterally isotopic, circular nanodisks can also be used as precursors for the preparation of chiral nanostructures.

    We prepared ensembles of circular gold nanodisks on a glass plate by a nanosphere lithography method. A glass plate was coated with a gold thin film, and an array of polystyrene spheres (500 nm diameter) was prepared on the gold film. The polystyrene spheres were etched by oxygen plasma, and the exposed gold film was etched by argon ion milling. As a result, an ensemble of gold nanodisks (~200 nm diameter) was obtained. Each nanodisk was capped with a polystyrene cone, and the cap was removed by sonication in toluene if necessary. We used both capped and uncapped nanodisk ensembles. The ensemble was irradiated with visible right- or left-CPL in the presence of silver ions and sodium citrate. The obtained Au-Ag nanostructures exhibited circular dichroism (CPL), indicating that the nanostructures have chirality. Initial deposition at arbitrary site may break the geometric symmetry, resulting in the growth into chiral structures. Saito, K.; Tatsuma, T. Nano Lett. 2018, 18, 3209–3212.

    Morisawa, K.; Ishida, T.; Tatsuma, T. ACS Nano 2020, 14, 3603–3609.

    Shimomura, K.; Nakane, Y.; Ishida, T.; Tatsuma, T. Appl. Phys. Lett. 2023, 122, 151109.

    Homma, T.; Sawada, N.; Ishida, T.; Tatsuma, T. ChemNanoMat 2023, 9, e202300096.

    Ishida, T.; Isawa, A.; Kuroki, S.; Kameoka, Y.; Tatsuma, T. Appl. Phys. Lett. 2023, 123, 061111.

    DOI： 10.1149/ma2024-01131099mtgabs

    Other Link： https://iopscience.iop.org/article/10.1149/MA2024-01131099mtgabs/pdf

  • Photoelectrochemical Fabrication of Chiral Plasmonic Nanostructures By Circularly Polarized Light

    Tetsu Tatsuma,Takuya Ishida,Hiroyasu Nishi

    ECS Meeting Abstracts   MA2022-01 ( 13 )   929 - 929   2022.7

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    Publisher：The Electrochemical Society  

    Chiral plasmonic nanostructures attracts attention because they are potentially applicable to optical materials such as enantioselective sensors and metamaterials, as well as photoelectrochemical devices. Chiral nanostructures are often prepared by electron beam lithography or synthesis based on DNA templates. We have recently developed a photoelectrochemical method, in which handedness of the chiral nanostructure can be controlled by right- or left- circularly polarized light.

    The photoelectrochemical method is based on plasmon-induced charge separation (PICS),<sup>1,2</sup> in which electrons are injected from a plasmonic metal nanoparticle to a semiconductor such as titania in direct contact. In PICS, anodic reactions often occur at the resonance sites of the plasmonic nanoparticle, at which electron oscillation is localized.<sup>3,4</sup> Energetic electron-hole pairs generate at the resonance site, and holes are used for the local anodic reaction, probably via trap sites. On the basis of the mechanisms, we have demonstrated site-selective etching of silver nanoparticles and site-selective deposition of lead oxide on gold nanoparticles.

    Under right-circularly polarized light (CPL), distribution of the resonance sites could be the mirror image of that under left-CPL.<sup>5</sup> Therefore, we performed site-selective deposition of lead oxide on gold nanocuboids on titania under right- or left-CPL.<sup>6</sup> As a result, lead oxide was deposited on the gold nanocuboids in a chiral geometry. The nanostructures thus obtained exhibited circular dichroism (CD), and the CD spectrum obtained for the structure prepared under right-CPL was opposite to that obtained for the structure prepared under left-CPL. Reversible switching of the handedness of the chiral plasmonic nanostructures can also be possible.<sup>7</sup> This method also allows us to fabricate spiral nanostructures. 1. Y. Tian and T. Tatsuma, J. Am. Chem. Soc., 127, 7632 (2005). 2. T. Tatsuma, H. Nishi, and T. Ishida, Chem. Sci., 8, 3325 (2017) [review]. 3. I. Tanabe and T. Tatsuma, Nano Lett., 12, 5418 (2012). 4. T. Tatsuma and H. Nishi, Nanoscale Horiz., 5, 597 (2020) [review]. 5. S. Hashiyada, T. Narushima, and H. Okamoto, J. Phys. Chem. C, 118, 22229 (2014). 6. K. Saito and T. Tatsuma, Nano Lett., 18, 3209 (2018). 7. K. Morisawa, T. Ishida, and T. Tatsuma, ACS Nano, 14, 3603 (2020).

    DOI： 10.1149/ma2022-0113929mtgabs

    Other Link： https://iopscience.iop.org/article/10.1149/MA2022-0113929mtgabs/pdf

  • Enhancement of Plasmon-Induced Charge Separation through Plasmon Coupling

    Tetsu Tatsuma,Hiroyasu Nishi,Takuya Ishida

    ECS Meeting Abstracts   MA2020-02 ( 61 )   3099 - 3099   2020.11

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    Publisher：The Electrochemical Society  

    Plasmon-induced charge separation (PICS)<sup>1,2</sup> involves electron transfer from plasmonic noble metal nanoparticles or compound nanoparticles to an n-type semiconductor such as TiO<sub>2</sub>. Oxidation reactions involved in PICS are based on a charge accumulation mechanism (Figure a) or a hole ejection mechanism (Figure b).<sup>3</sup> The latter enables nanoscale local oxidation at relatively positive potentials.<sup>4-7</sup> This can be applied to photoinduced nanofabrication beyond the diffraction limit of light. For instance, chiral plasmonic nanostructures can be prepared by PICS under right or left circularly polarized light (Figure c).<sup>8,9</sup> Some other applications of the plasmonic hole ejection will also be mentioned. Enhancement of PICS with hole ejection through plasmon coupling<sup>10</sup> and its application to photocatalysis will also be described.

    References Y. Tian and T. Tatsuma, J. Am. Chem. Soc., 127, 7632 (2005).

    T. Tatsuma, H. Nishi, and T. Ishida, Chem. Sci., 8, 3325 (2017) [review].

    T. Tatsuma and H. Nishi, Nanoscale Horiz., 5, 597-606 (2020) [review].

    E. Kazuma, N. Sakai, and T. Tatsuma, Chem. Commun., 47, 5777 (2011).

    I. Tanabe and T. Tatsuma, Nano Lett., 12, 5418 (2012).

    K. Saito, I. Tanabe, and T. Tatsuma, J. Phys. Chem. Lett., 7, 4363 (2016).

    H. Nishi, M. Sakamoto, and T. Tatsuma, Chem. Commun., 54, 11741 (2018).

    K. Saito and T. Tatsuma, Nano Lett., 18, 3209 (2018).

    K. Morisawa, T. Ishida, and T. Tatsuma, ACS Nano, 14, 3603 (2020).

    T. Ishida and T. Tatsuma, J. Phys. Chem. C, 122, 26153 (2018).





    Figure 1

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    DOI： 10.1149/ma2020-02613099mtgabs

    Other Link： https://iopscience.iop.org/article/10.1149/MA2020-02613099mtgabs/pdf

  • Reaction Site Analysis for Plasmon-Induced Charge Separation

    Tetsu Tatsuma,Hiroyasu Nishi,Koichiro Saito,Takuya Ishida,Kun-Che Kao

    ECS Meeting Abstracts   MA2018-01 ( 11 )   931 - 931   2018.4

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    Publisher：The Electrochemical Society  

    Plasmon-induced charge separation (PICS)<sup>1-3</sup> involves electron transfer from plasmonic nanoparticles of Au, Ag, or Cu to a semiconductor, typically TiO<sub>2</sub>.<sup>1-4</sup> The electron transfer is caused by external photoelectric effects (including hot carrier injection) or interfacial electron transition.<sup>3</sup> We have reported that oxidation of Ag to Ag<sup>+</sup> occurs at the Ag nanoparticle surface in PICS of Ag-TiO<sub>2</sub> systems,<sup>5</sup> and this reaction occurs preferentially at the sites where optical near field is localized.<sup>6-8</sup> This can be explained in terms of ejection of energetic holes from the nanoparticles as Ag<sup>+</sup> ions.<sup>8,9</sup> This possibility has been further investigated on the basis of other anodic reactions. For a system with isolated Au nanoparticles on TiO<sub>2</sub>, the interface mode may be more important than the full-surface mode. However, plasmon coupling between two nanoparticles, which enhances full-surface mode but not necessarily enhances the interface mode, increases the PICS efficiency. This could also indicate that not only injection of electrons from Au nanoparticles into TiO<sub>2</sub> but also ejection of holes from Au nanoparticles play an important role in those PICS systems. Y. Tian and T. Tatsuma, J. Am. Chem. Soc., 127, 7632 (2005).

    Y. Tian and T. Tatsuma, Chem. Commun., 2004, 1810.

    T. Tatsuma, H. Nishi, and T. Ishida, Chem. Sci., 8, 3325 (2017) [review].

    E. Kazuma and T. Tatsuma, Adv. Mater. Interfaces, 1, 1400066 (2014).

    Y. Ohko, T. Tatsuma, T. Fujii, K. Naoi, C. Niwa, Y. Kubota, and A. Fujishima, Nat. Mater., 2, 29 (2003).

    E. Kazuma, N. Sakai, and T. Tatsuma, Chem. Commun., 47, 5777 (2011).

    I. Tanabe and T. Tatsuma, Nano Lett., 12, 5418 (2012).

    K. Saito, I. Tanabe, and T. Tatsuma, J. Phys. Chem. Lett., 7, 4363 (2016).







    Figure 1

    <p></p>

    DOI： 10.1149/ma2018-01/11/931

    Other Link： https://iopscience.iop.org/article/10.1149/MA2018-01/11/931/pdf

  • Plasmon-Induced Charge Separation and Electric Field Localization

    Tetsu Tatsuma,Koichiro Saito,Takuya Ishida,Hiroyasu Nishi

    ECS Meeting Abstracts   MA2017-01 ( 13 )   830 - 830   2017.4

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    Plasmon-induced charge separation (PICS) occurs at the interface between plasmonic nanostructures of Au, Ag, or Cu and a semiconductor (e.g., TiO<sub>2</sub>).<sup>1-3</sup> Carrier transfer from the nanostructure to the semiconductor due to external photoelectric effects (including hot carrier injection) or interfacial electron transition is responsible for PICS.<sup>4</sup> We reported PICS for the first time more than 10 years ago<sup>1,2</sup> and studied its mechanisms<sup>4,5</sup> and applications.<sup>1,3,6,7</sup> In particular, we have reported effects of localized electric field on PICS. In the case of PICS-based oxidation of Ag nanoparticles, anodic reaction (i.e., oxidation of Ag to Ag<sup>+</sup>) occurs preferentially at the sites where optical near field is localized.<sup>8-10</sup> This may be explained in terms of ejection of energetic holes from the nanoparticles as Ag<sup>+</sup> ions.<sup>10</sup>

    1. Y. Tian and T. Tatsuma, J. Am. Chem. Soc., 127, 7632 (2005).

    2. Y. Tian and T. Tatsuma, Chem. Commun., 2004, 1810.

    3. T. Tatsuma, Bull. Chem. Soc. Jpn., 86, 1 (2013) [account].

    4. E. Kazuma and T. Tatsuma, Adv. Mater. Interfaces, 1, 1400066 (2014).

    5. H. Nishi and T. Tatsuma, Angew. Chem. Int. Ed., 55, 10771 (2016).

    6. Y. Ohko, T. Tatsuma, T. Fujii, K. Naoi, C. Niwa, Y. Kubota, and A. Fujishima, Nat. Mater., 2, 29 (2003).

    7. Y. Takahashi and T. Tatsuma, Appl. Phys. Lett., 99, 182110 (2011).

    8. E. Kazuma, N. Sakai, and T. Tatsuma, Chem. Commun., 47, 5777 (2011).

    9. I. Tanabe and T. Tatsuma, Nano Lett., 12, 5418 (2012).

    10. K. Saito, I. Tanabe, and T. Tatsuma, J. Phys. Chem. Lett., 7, 4363 (2016).

    DOI： 10.1149/ma2017-01/13/830

    Other Link： https://iopscience.iop.org/article/10.1149/MA2017-01/13/830/pdf

  • 金ナノ粒子の疎水化と薄膜化の試み Reviewed

    石田拓也,山田 淳

    化学工業   66   731 - 735   2015

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    Authorship：Lead author   Language：Japanese  

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Presentations

  • Optical near-field fabrication of chiral nanostructures Invited International conference

    Takuya Ishida

    Frontiers in Chiral Plasmonics  2025.12 

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    Event date： 2025.12

    Language：English   Presentation type：Oral presentation (invited, special)  

    Venue：Tokyo, Japan  

  • Magneto-Chiral Metamaterials Exhibiting Directional Dichroism Fabricated by Photoelectrochemistry International conference

    Takuya Ishida

    ISOP & IWOB   2025.12 

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    Event date： 2025.11 - 2025.12

    Language：English   Presentation type：Poster presentation  

    Venue：Tochigi, Japan   Country：Japan  

  • 磁気キラルナノ構造による可視無偏光に対する非相反光学応答

    石田拓也

    第19回さきがけ研究者交流会  2025.11 

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    Event date： 2025.11

    Presentation type：Oral presentation (general)  

    Venue：東京都千代田区  

  • Asymmetric Transmission through Magneto-chiral Plasmonic Nanoparticles Prepared by Circularly Polarized Light Invited International conference

    Takuya Ishida, Tetsu Tatsuma

    PIERS 2025 (PhotonIcs and Electromagnetics Research Symposium)  2025.11 

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    Event date： 2025.11

    Language：English   Presentation type：Oral presentation (invited, special)  

    Venue：Chiba, Japan   Country：Japan  

  • Magneto-Chiral Metasurfaces Invited International conference

    Takuya Ishida, Tetsu Tatsuma

    The 10th International Workshop on Advanced Nanoscience and Nanomaterials – IWANN 2025 in Thailand –  2025.11 

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    Event date： 2025.11

    Language：English   Presentation type：Oral presentation (invited, special)  

    Venue：Chon Buri, Kingdom of Thailand   Country：Thailand  

  • Near-field Photocatalysis for Structural Control of Semiconductor Nanoparticles Invited International conference

    Seung Hyuk Lee, Haruka Kondo, Ruizhe Zhao, Takuya Ishida, Tetsu Tatsuma

    The 10th International Workshop on Advanced Nanoscience and Nanomaterials – IWANN 2025 in Thailand –  2025.11 

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    Event date： 2025.11

    Language：English   Presentation type：Oral presentation (general)  

    Venue：Chon Buri, Kingdom of Thailand   Country：Thailand  

  • Magneto-Chiral Nanocomposites Consisting of Au Nanocuboids and FeOx Prepared by Circularly Polarized Light International conference

    Takuya Ito, Takuya Ishida, Seung Hyuk Lee, Tetsu Tatsuma

    The 10th International Workshop on Advanced Nanoscience and Nanomaterials – IWANN 2025 in Thailand –  2025.11 

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    Event date： 2025.11

    Language：English   Presentation type：Oral presentation (general)  

    Venue：Chon Buri, Kingdom of Thailand   Country：Thailand  

  • Development of Flexible Magneto-optical Materials Based on CoPt Alloy Nanoparticles International conference

    Chen Zhang, Takuya Ishida, Seung Hyuk Lee, Tetsu Tatsuma

    The 10th International Workshop on Advanced Nanoscience and Nanomaterials – IWANN 2025 in Thailand –  2025.11 

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    Event date： 2025.11

    Language：English   Presentation type：Oral presentation (general)  

    Venue：Chon Buri, Kingdom of Thailand   Country：Thailand  

  • Plasmonic Chiral Au@Ag Nanostructures Fabricated under Circularly Polarized Light International conference

    Hikaru Takahashi, Takuya Ishida, Seung Hyuk Lee, Tetsu Tatsuma

    The 10th International Workshop on Advanced Nanoscience and Nanomaterials – IWANN 2025 in Thailand –  2025.11 

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    Event date： 2025.11

    Language：English   Presentation type：Oral presentation (general)  

    Venue：Chon Buri, Kingdom of Thailand   Country：Thailand  

  • 偏光を利用した光電気化学的手法によるAu-Agナノ構造体の形態制御

    八島 廉、石田拓也、立間 徹

    第15回CSJ化学フェスタ2025  2025.10 

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    Event date： 2025.10

    Presentation type：Poster presentation  

    Venue：東京都江戸川区  

  • 磁気キラルAu@Fe3O4ナノ複合体アレイ構造の光電気化学的手法による作製

    劉 秦呈・石田 拓也・イ スンヒョク・立間 徹

    第15回CSJ化学フェスタ2025  2025.10 

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    Event date： 2025.10

    Presentation type：Poster presentation  

    Venue：東京都江戸川区  

  • CoPt合金ナノ粒子を用いたフレキシブル磁気光学材料の開発

    張 晨,石田拓也,イ スンヒョク,山根治起,立間 徹

    第49回日本磁気学会学術講演会  2025.9 

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    Event date： 2025.9

    Presentation type：Oral presentation (general)  

    Venue：愛媛県松山市  

  • 光誘起磁化制御に向けたプラズモン共鳴によるスピン角運動量増強

    伊知地直樹,石田拓也,森近一貴,立間 徹,芦原 聡

    第49回日本磁気学会学術講演会  2025.9 

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    Event date： 2025.9

    Presentation type：Poster presentation  

    Venue：愛媛県松山市  

  • 錯体の熱分解による希土類フッ化物ナノ結晶の合成と磁気光学特性

    川島 祥,宮脇拓也,石田拓也,立間 徹,甲谷 繁

    第49回日本磁気学会学術講演会  2025.9 

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    Event date： 2025.9

    Presentation type：Poster presentation  

    Venue：愛媛県松山市  

  • 円偏光誘起反応による等方的ナノ粒子のキラル形状化

    石田 拓也,劉 嘉捷,亀岡 ゆり,イ スンヒョク,笠井 大幹,杉本 泰,藤井 稔,立間 徹

    第86回応用物理学会秋季学術講演会  2025.9 

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    Event date： 2025.9

    Presentation type：Oral presentation (general)  

    Venue：愛知県名古屋市  

  • Otto配置型プラズモン水素センサにおけるPt表面触媒層の効果

    山根 治起,柴田 寿人,石田 拓也,立間 徹

    第85回 応用物理学会秋季学術講演会  2025.9 

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    Event date： 2025.9

    Presentation type：Oral presentation (general)  

    Venue：愛知県名古屋市  

  • 光学活性物質の識別に向けたプラズモン近接場の設計

    伊知地 直樹,石田 拓也,森近 一貴,大上 能悟,立間 徹,芦原 聡

    第86回応用物理学会秋季学術講演会  2025.9 

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    Event date： 2025.9

    Presentation type：Poster presentation  

    Venue：愛知県名古屋市  

  • 金ナノ直方体と酸化鉄からなる磁気キラル複合体の円偏光による作製

    伊藤拓哉,石田拓也,Seung Hyuk Lee,立間 徹

    2025年光化学討論会  2025.9 

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    Event date： 2025.9

    Presentation type：Poster presentation  

    Venue：東京都豊島区  

  • プラズモニックナノ構造体への円偏光照射による３次元キラル電場の形成機構

    石田拓也,伊知地直樹,森近 一貴,芦原 聡,立間 徹

    2025年光化学討論会  2025.9 

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    Event date： 2025.9

    Presentation type：Oral presentation (general)  

    Venue：東京都豊島区  

  • 円偏光誘起電気化学反応によるプラズモニックなキラルAu@Agナノ構造体の作製

    髙橋 輝,石田 拓也,イスンヒョク,立間 徹

    2025電気化学秋季大会  2025.9 

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    Event date： 2025.9

    Presentation type：Oral presentation (general)  

    Venue：鳥取県鳥取市  

    プラズモニックなキラルナノ構造体は、局在表面プラズモン共鳴（LSPR）により強いキラル光学応答を示すため、キラル分子センサや負の屈折率を持つメタマテリアルへの応用が期待されている。しかし、可視域で負の屈折率を実現するには、光波長の1/10以下での精密な構造制御が必要である。我々は、円偏光をキラル源とした簡便なキラルナノ構造作製手法を開発し、熱正孔による酸化析出や熱電子による還元析出を用いてキラル構造体を作製してきた。本研究では、アキラルなAuナノ粒子に円偏光を照射してAgを析出させ、キラルナノ構造体を作製した。さらにFDTD電磁場解析法により、キラル形状化過程と光学応答の解析を行った。

  • Enhancement of optical chirality using circular plasmonic structures International conference

    Naoki Ichiji, Takuya Ishida, Ikki Morichika, Daigo Oue, Tetsu Tatsuma, Satoshi Ashihara

    The 11th International Conference on Surface Plasmon Photonics (SPP11)  2025.5 

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    Event date： 2025.5

    Presentation type：Poster presentation  

    Venue：Chiyoda-ku, Tokyo   Country：Japan  

  • 円偏光で作製したプラズモニックAu@Agナノ構造体のキラル光学効果

    髙橋 輝,石田 拓也,立間 徹

    日本化学会第105回春季年会  2025.3 

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    Event date： 2025.3

    Presentation type：Oral presentation (general)  

    Venue：大阪府吹田市  

  • 非相反光学応答を目指した磁気キラルメタマテリアルの光電気化学的手法による作製 Invited

    石田拓也,立間徹

    2025年電子情報通信学会総合大会  2025.3 

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    Event date： 2025.3

    Presentation type：Oral presentation (invited, special)  

    Venue：東京都世田谷区  

  • 可視無偏光に対し非対称透過挙動を示す磁気キラルFe3O4-Agナノ複合体の光電気化学的作製

    伊藤拓哉,石田拓也,立間 徹

    電気化学会第92回大会  2025.3 

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    Event date： 2025.3

    Presentation type：Oral presentation (general)  

    Venue：東京都小金井  

  • 周回プラズモンモード励起に伴う増強近接場における光学キラリティの波長依存性

    伊知地 直樹, 石田 拓也, 森近 一貴, 大上 能悟, 立間 徹, 芦原 聡

    第72回応用物理学会春季学術講演会 2025年3月14日  2025.3 

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    Event date： 2025.3

    Presentation type：Oral presentation (general)  

    Venue：千葉県野田市  

  • 円偏光誘起キラル電場を利用した磁気キラルナノ構造の作製 Invited

    石田拓也,立間徹

    第51回光機能磁性デバイス・材料専門研究会『光、電子、磁気とキラルに関する研究の新展開』  2025.1 

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    Event date： 2025.1

    Presentation type：Oral presentation (invited, special)  

    Venue：東京都千代田区  

  • 磁気キラル光学効果を示す酸化鉄-Agナノ複合体の形態制御

    伊藤 拓哉,石田 拓也,Seunghyuk Lee,立間 徹

    第14回CSJ化学フェスタ2024  2024.10 

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    Event date： 2024.10

    Presentation type：Poster presentation  

  • Plasmonic Fabrication of Chiral and Magneto-Chiral Nanostructures

    Tetsu Tatsuma,Takuya Ishida

    PRiME 2024  2024.10 

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    Event date： 2024.10

    Presentation type：Oral presentation (invited, special)  

  • Synthesis and Characterization of Superparamagnetic CoPt Alloy Nanoparticles Exhibiting Magneto-Plasmonic Responses

    Chen Zhang,Takuya Ishida,Tetsu Tatsuma

    PRiME 2024  2024.10 

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    Event date： 2024.10

    Presentation type：Poster presentation  

  • 磁気およびキラル光学応答を示すナノ構造体の円偏光による作製

    石田拓也,澤田直樹,伊藤拓哉,イ スンヒョク,立間 徹

    第48回日本磁気学会学術講演会  2024.9 

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    Event date： 2024.9

    Presentation type：Oral presentation (general)  

    Venue：秋田県秋田市  

  • 円偏光励起によるプラズモニックナノ構造上の電荷の回転運動制御

    伊知地 直樹,石田拓也,大上能悟,森近一貴,立間 徹,芦原 聡

    第85回 応用物理学会秋季学術講演会  2024.9 

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    Event date： 2024.9

    Presentation type：Oral presentation (general)  

  • 周回プラズモンモード励起に伴うキラリティを有した近接場の生成

    伊知地 直樹,石田拓也,森近一貴,立間 徹,芦原 聡

    第85回 応用物理学会秋季学術講演会  2024.9 

    　More details

    Event date： 2024.9

    Presentation type：Oral presentation (general)  

  • CoPt合金ナノ粒子の磁気プラズモニック特性

    張 晨,石田拓也,イ スンヒョク,立間 徹

    第85回 応用物理学会秋季学術講演会  2024.9 

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    Event date： 2024.9

    Presentation type：Poster presentation  

  • キラルAgメタサーフェスの円偏光による作製

    石田拓也,黒木秀起,立間 徹

    第85回 応用物理学会秋季学術講演会  2024.9 

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    Event date： 2024.9

    Presentation type：Oral presentation (general)  

  • 円偏光により作製した磁気キラルメタマテリアルの非相反光学効果

    石田拓也,澤田直樹,イ スンヒョク,立間 徹

    2024年光化学討論会  2024.9 

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    Event date： 2024.9

    Presentation type：Oral presentation (general)  

    Venue：福岡県福岡市  

  • 円偏光による磁気キラル金@酸化鉄ナノ複合体の作製

    小林主尚,石田拓也,イ スンヒョク,立間 徹

    2024年光化学討論会  2024.9 

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    Event date： 2024.9

    Presentation type：Poster presentation  

    Venue：福岡県福岡市  

  • Morphology Control of Chiral Plasmonic Nanoparticles by Circularly Polarized Light

    Hikaru TAKAHASHI,Takuya ISHIDA,Tetsu TATSUMA

    Annual Meeting on Photochemistry 2024  2024.9 

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    Event date： 2024.9

    Language：English   Presentation type：Poster presentation  

    Venue：Fukuoka-city, Fukuoka  

  • Shaping Nanomaterials by Plasmon and Mie resonances for Nanophotonic Device Fabrication

    Tetsu Tatsuma,Takuya Ishida,Seung-Hyuk Lee

    24th International Conference on Photochemical Conversion and Storage of Solar Energy  2024.8 

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    Event date： 2024.7 - 2024.8

  • Spin angular momentum of enhanced electric fields around a plasmonic nanostructures excited by circularly polarized light

    Naoki Ichiji,Takuya Ishida,Ikki Morichika,Tetsu Tatsuma,Satoshi Ashihara

    The 14th International Conference on Metamaterials, Photonic Crystals and Plasmonics  2024.7 

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    Event date： 2024.7

    Presentation type：Poster presentation  

    Venue：Toyama, Japan  

  • プラズモニックナノ構造を用いたスピン角運動量の付随する増強電磁場励起

    伊知地 直樹,石田 拓也,森近 一貴,立間 徹,芦原 聡

    第20回プラズモニクスシンポジウム  2024.6 

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    Event date： 2024.6

    Presentation type：Oral presentation (general)  

  • Plasmonic Nanofabrication of Chiral Nanoplate Ensembles

    Tetsu Tatsuma,Takuya Ishida,Yuri Kameoka,Shuki Kuroki

    245th ECS Meeting  2024.5 

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    Event date： 2024.5

    Presentation type：Oral presentation (invited, special)  

  • Rotationally displaced intensity distribution around square nano-plates excited by circularly polarized light

    Naoki Ichiji,Takuya Ishida,Ikki morichika,Tetsu Tatsuma,Satoshi Ashihara

    Conference on Lasers and Electro-Optics (CLEO) 2024  2024.5 

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    Event date： 2024.5

    Presentation type：Poster presentation  

    Venue：Charlotte, North Carolina United States  

  • 円偏光励起による正方形ナノプレート近傍電場分布の回転変位

    伊知地直樹,石田拓也,森近一貴,立間 徹,芦原 聡

    2024年第71回応用物理学会春季学術講演会  2024.3 

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    Event date： 2024.3

    Presentation type：Oral presentation (general)  

    Venue：東京都世田谷区  

  • 円偏光により作製した磁気キラルプラズモニックナノ粒子の非対称透過

    石田拓也,澤田直樹,イ スンヒョク,立間 徹

    2024年第71回応用物理学会春季学術講演会  2024.3 

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    Event date： 2024.3

    Presentation type：Oral presentation (general)  

    Venue：東京都世田谷区  

  • キラルAgナノ粒子アレイのキラル光学応答に対するプラズモンカップリングの影響

    黒木秀起,石田拓也,立間 徹

    2024年第71回応用物理学会春季学術講演会  2024.3 

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    Event date： 2024.3

    Presentation type：Oral presentation (general)  

    Venue：東京都  

  • 円偏光励起によるAuナノキューブ周辺のキラルな電場分布形成機構

    石田拓也,伊知地直樹,森近一貴,芦原 聡,立間 徹

    2024年第71回応用物理学会春季学術講演会  2024.3 

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    Event date： 2024.3

    Presentation type：Oral presentation (general)  

    Venue：東京都  

  • CoPtナノ粒子およびその複合体が示す磁気光学効果

    張晨,石田拓也,Lee Seung Hyuk,立間 徹

    日本化学会第104春季年会  2024.3 

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    Event date： 2024.3

    Venue：千葉県船橋市  

  • 非対称光透過を示す磁気キラルプラズモニック粒子の作製

    石田拓也,澤田直樹,Lee Seung Hyuk,立間 徹

    電気化学会第91回大会  2024.3 

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    Event date： 2024.3

    Venue：愛知県名古屋市  

  • 円偏光照射による金ナノディスクのキラル形状化

    亀岡ゆり,石田拓也,立間 徹

    電気化学会第91回大会  2024.3 

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    Event date： 2024.3

    Venue：愛知県名古屋市  

  • SPPに付随するスピン角運動量を利用したナノアンテナ構造の局所励起

    伊知地 直樹,石田 拓也,森近 一樹,立間 徹,芦原 聡

    Optics ＆ Photonics Japan 2023  2023.11 

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    Event date： 2023.11

    Venue：北海道札幌市  

  • Chiral electric field distribution on square nano-antennas induced by circularly polarized light

    Naoki Ichiji,Takuya Ishida,Ikki Morichika,Tetsu Tatsuma,Satoshi Ashihara

    　More details

    Event date： 2023.11

  • Magneto-Plasmonic Response Enhancement of Au@Fe2O3 Nanocomposites Fabricated by Plasmon-Induced Charge Separation Invited

    Takuya Ishida,Rui-Zhuo Sun,Seung Hyuk Lee,Tetsu Tatsuma

    The 8th International Workshop on Advanced Nanoscience and Nanomaterials 2023  2023.10 

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    Event date： 2023.10

    Language：English   Presentation type：Oral presentation (invited, special)  

    Venue：Hankyong National University, Anseong, Korea  

  • Fe3O4-Agナノ複合体の円偏光による作製と磁気キラル光学応答の制御

    小林主尚,澤田直樹,石田拓也,立間徹

    第13回CSJ化学フェスタ2023  2023.10 

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    Event date： 2023.10

    Presentation type：Poster presentation  

    Venue：東京都江戸川区  

  • 円偏光照射によるキラル銀ナノ粒子のコロイド合成

    髙橋 輝,黒木秀起,石田拓也,立間 徹

    第13回CSJ化学フェスタ2023  2023.10 

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    Event date： 2023.10

    Presentation type：Poster presentation  

    Venue：東京都江戸川区  

  • 円偏光で作製したキラルAgナノ粒子アレイにおけるプラズモンカップリングの影響

    石田 拓也,黒木 秀起,立間 徹

    2023年第84回応用物理学会秋季学術講演会  2023.9 

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    Event date： 2023.9

    Presentation type：Oral presentation (general)  

    Venue：熊本県熊本市  

  • 円偏光によるプラズモニックナノ粒子のキラル形状化とキラリティの解析

    石田 拓也,黒木 秀起,亀岡 ゆり,立間 徹

    2023電気化学秋季大会  2023.9 

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    Event date： 2023.9

    Presentation type：Oral presentation (general)  

    Venue：福岡県福岡市  

  • 円偏光による銀ナノ粒子の加工とキラル光学応答の制御

    黒木 秀起,石田 拓也,立間 徹

    2023年光化学討論会  2023.9 

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    Event date： 2023.9

    Presentation type：Poster presentation  

    Venue：広島県広島市  

  • プラズモン誘起電荷分離により作製したAu@Fe2O3ナノ複合体の磁気プラズモニック特性増強

    石田拓也,孫 瑞卓,李 昇爀,立間 徹

    2023年光化学討論会  2023.9 

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    Event date： 2023.9

    Presentation type：Oral presentation (general)  

    Venue：広島県広島市  

  • 非対称透過を示す超常磁性Fe3O4ーキラルAgナノ複合体の作製

    澤田 直樹,小林 主尚,石田 拓也,立間 徹

    2023年光化学討論会  2023.9 

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    Event date： 2023.9

    Presentation type：Poster presentation  

    Venue：広島県広島市  

  • キラルプラズモニックナノ構造体の円偏光による作製と光学特性 Invited

    石田拓也,立間徹

    第44回光化学若手の会  2023.6 

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    Presentation type：Oral presentation (invited, special)  

    Venue：兵庫県淡路市  

  • CoPt磁性ナノ粒子修飾電極によるエナンチオ選択的還元反応

    薮野 真弥,イ スンヒョク,石田 拓也,立間 徹

    電気化学会第90回大会  2023.3 

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    Event date： 2023.3

    Presentation type：Oral presentation (general)  

    Venue：宮城県仙台市  

  • 円偏光照射によるキラルAgナノ粒子の作製とそのキラル光学特性

    黒木秀起,石田拓也,立間 徹

    電気化学会第90回大会  2023.3 

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    Event date： 2023.3

    Presentation type：Oral presentation (general)  

    Venue：宮城県仙台市  

  • プラズモン誘起電荷分離により作製した金－酸化鉄コアシェル構造の磁気光学効果

    孫瑞卓,石田拓也,立間 徹

    日本化学会第103春季年会2023  2023.3 

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    Event date： 2023.3

    Presentation type：Oral presentation (general)  

    Venue：千葉県野田市  

  • 円偏光照射によるキラル銀ナノ粒子のガラス基板上での作製

    黒木 秀起,石田 拓也,立間 徹

    第12回CSJ化学フェスタ2022  2022.10 

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    Event date： 2022.10

    Presentation type：Poster presentation  

  • プラズモン誘起還元反応によるAgナノ粒子の成長

    亀岡 ゆり,石田 拓也,立間 徹

    第12回CSJ化学フェスタ2022  2022.10 

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    Event date： 2022.10

    Presentation type：Poster presentation  

  • 近赤外域でキラル光学応答を示すAu複合体

    澤田 直樹,本間 徹,石田 拓也,立間 徹

    第12回CSJ化学フェスタ2022  2022.10 

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    Event date： 2022.10

    Presentation type：Poster presentation  

  • 円偏光照射によるキラル Ag ナノ構造の作製

    石田 拓也,井澤 哲舜,黒木 秀起,立間 徹

    第83回応用物理学会秋季学術講演会  2022.9 

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    Event date： 2022.9

    Presentation type：Poster presentation  

  • 円偏光による Ag ナノ構造の作製とそのキラル光学特性

    石田 拓也,井澤 哲舜,黒木 秀起,立間 徹

    2022年光化学討論会  2022.9 

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    Event date： 2022.9

    Presentation type：Oral presentation (general)  

  • プラズモン共鳴銀ナノ構造の光電気化学的加工

    石田 拓也,黒木 秀起,亀岡 ゆり,井澤 哲舜,立間 徹

    2022年電気化学会秋季大会  2022.9 

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    Event date： 2022.9

    Presentation type：Oral presentation (general)  

  • ２次元キラル光学応答を示す銀ナノプレートの円偏光による作製

    井澤哲舜,石田拓也,立間徹

    日本化学会第102春季年会  2022.3 

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    Event date： 2022.3

    Presentation type：Oral presentation (general)  

  • CoPt–Au ナノ粒子間カップリングを利用したエナンチオ選択的光触媒反応

    石田拓也,青木千佳,立間徹

    2021年光化学討論会  2021.9 

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    Event date： 2021.9

    Presentation type：Oral presentation (general)  

  • プラズモニックナノ構造体におけるキラル光学特性の形態依存性

    中根佑真,石田拓也,立間徹

    2021年光化学討論会  2021.9 

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    Event date： 2021.9

    Presentation type：Poster presentation  

  • キラルナノ周期構造のプラズモン共鳴を用いた造形

    本間徹,石田拓也,立間徹

    2021年光化学討論会  2021.9 

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    Event date： 2021.9

    Presentation type：Poster presentation  

  • CoPt–Auプラズモニック光触媒による磁場誘起立体選択的反応

    石田拓也,青木千佳,立間徹

    第82回応用物理学会秋季学術講演会  2021.9 

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    Event date： 2021.9

    Presentation type：Oral presentation (general)  

  • プラズモン誘起電荷分離により作製したキラルなスパイラルナノ構造体のサイズ依存性

    中根佑真,石田拓也,立間 徹

    電気化学会第88回大会  2021.3 

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    Event date： 2021.3

    Presentation type：Oral presentation (general)  

  • 銀ナノキューブ上における局在表面プラズモン共鳴に基づく酸化還元反応の制御

    井澤哲舜,石田拓也,立間 徹

    日本化学会第101回春季年会  2021.3 

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    Event date： 2021.3

    Presentation type：Oral presentation (general)  

  • Enhancement of;Plasmon-Induced Charge Separation through;Plasmon Coupling

    Tetsu Tatsuma,Hiroyasu Nishi,Takya Ishida

    PRiME 2020  2020.10 

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    Event date： 2020.10

    Presentation type：Oral presentation (general)  

  • プラズモン誘起電荷分離によるらせん状キラルナノ構造の作製

    石田拓也,下村孔輝,立間 徹

    2020年光化学討論会  2020.9 

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    Event date： 2020.9

    Presentation type：Oral presentation (general)  

  • Plasmon-Induced Charge Separation under Visible Light through Au-Pt Heterometallic Interparticle Coupling

    Yukika Aoki,Takuya Ishida,Tetsu Tatsuma

    2020年光化学討論会  2020.9 

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    Event date： 2020.9

    Presentation type：Poster presentation  

  • Au-Ptナノ粒子間カップリングによるプラズモン誘起電荷分離

    石田拓也,青木千佳,立間 徹

    2020年度第81回応用物理学会秋季学術講演会  2020.9 

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    Event date： 2020.9

    Presentation type：Oral presentation (general)  

  • 異種金属ナノ粒子間のプラズモンカップリングを利用した光誘起電荷分離

    青木千佳,石田拓也,立間徹

    電気化学会大87回大会  2020.3 

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    Event date： 2020.3

    Presentation type：Oral presentation (general)  

  • プラズモン誘起電荷分離における熱電子及び熱正孔の段階的注入

    石田拓也,戸江紫乃,立間徹

    2020年 第67回応用物理学会春季学術講演会  2020.3 

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    Event date： 2020.3

    Presentation type：Oral presentation (general)  

  • 金ナノキューブへの円偏光照射によるキラルナノ構造の作製

    下村孔輝,石田拓也,立間徹

    日本化学会第100回春季年会  2020.3 

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    Event date： 2020.3

    Presentation type：Oral presentation (general)  

  • プラズモン誘起電荷分離における熱電子及び正孔の段階的注入

    石田拓也,戸江紫乃,立間徹

    第38回固体・表面光化学討論会  2019.11 

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    Event date： 2019.11

    Presentation type：Oral presentation (general)  

  • Stepwise Injection of Energetic Carriers in PICS

    Takuya Ishida,Shino Toe,Tetsu Tatsuma

    International Workshop on Advanced Nanoscience and Nanomaterials 2023  2019.11 

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    Event date： 2019.11

    Presentation type：Oral presentation (general)  

  • プラズモン誘起電荷分離によるキラル金ナノキューブの作製

    下村孔輝,石田拓也,立間徹

    第9回CSJ化学フェスタ2019  2019.10 

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    Event date： 2019.10

    Presentation type：Poster presentation  

  • 半導体に担持した白金ナノ粒子のプラズモン共鳴特性の制御

    青木千佳,石田拓也,立間徹

    第9回CSJ化学フェスタ2019  2019.10 

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    Event date： 2019.10

    Presentation type：Poster presentation  

  • プラズモン誘起電荷分離における非対称粒子間 カップリングの影響

    石田拓也,立間徹

    2019年光化学討論会  2019.9 

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    Event date： 2019.9

    Presentation type：Oral presentation (general)  

  • プラズモン誘起電荷分離における粒子間カップリングの影響

    石田拓也,立間徹

    第16回プラズモニクスシンポジウム  2019.5 

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    Event date： 2019.5

    Presentation type：Oral presentation (general)  

  • 非対称カップリングによるプラズモン誘起電荷分離の効率改善

    石田拓也,立間 徹

    2019年 第66回応用物理学会春季学術講演会  2019.3 

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    Event date： 2019.3

    Presentation type：Oral presentation (general)  

▼display all

Awards for Research Activities

  • 優秀講演賞

    2017.11   第36回固体・表面光化学討論会  

    石田拓也

  • 学生優秀ポスター賞

    2011.8   第28回九州コロイドコロキウム  

    石田拓也

  • 理学部賞

    2011.3   鹿児島大学理学部  

    石田拓也

Research Projects

  • 表面格子共鳴による巨大な非相反光学応答の実現

    Grant number：JPMJPR24L3  2024.10 - 2028.3

    戦略的創造研究推進事業 個人型研究(さきがけ) 

    石田拓也

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    Authorship：Principal investigator 

    光でつなぐ情報と物理の融合分野の開拓（光融合）

  • 可視光応答型磁気キラルメタマテリアルの円偏光による創製

    Grant number：24K08359  2024.4 - 2027.3

    Grants-in-Aid for Scientific Research (KAKENHI) 

    石田 拓也

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    Authorship：Principal investigator 

    Grant amount：\4680000 （ Direct Cost: \3600000 、 Indirect Cost：\1080000 ）

  • 金ナノ粒子・金クラスターを用いた高効率プラズモン誘起太陽電池の開発

    Grant number：13J11083  2013.4 - 2016.3

    Grants-in-Aid for Scientific Research (KAKENHI) 

    石田 拓也

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    Grant amount：\2700000 （ Direct Cost: \2700000 ）

    オクタデカンチオール(ODT)またはポルフィリン連結アルカンチオール誘導体(PC10S)で表面修飾した金ナノ粒子(AuNP)(ODT-AuNPならびにPC10S-AuNP)の評価と,簡便な固定化法の確立並びに評価を行った.
    局在表面プラズモン共鳴（LSPR）を示すAuNPを基板に固定化する技術を確立することは,表面プラズモン(SP)をデバイスへ応用していく上で重要な課題であり,明瞭なLSPRを示す粒径10 nm以上のAuNPの組織体を構築することが必須である.本研究では簡便に高密度単粒子膜を作製可能なLangmuir-Blodgett(LB)法を用いて,AuNP基板の作製を試みた.しかし,LB法にはAuNPが低極性有機溶媒に可溶かつ安定でなければならないという制限があるため,粒径10 nm未満のAuNPが限界であった.LSPRによる増強電場は,粒径50 nm程度で最大になるので,より大きな粒子を用いることが望ましい.そこで,粒径50 nmまでのODT-AuNPの合成を前年度までに報告した.本年度は,LB法によるODT-AuNP膜作製を行った.その結果,高密度単粒子膜を作製し,粒径による共鳴波長制御に成功した.また,大きな粒子の粒子膜は,より大きな増強電場を発生させているものと考えている.
    次に,ODT-AuNPの技術を応用して,PC10S-AuNP基板を作製した.まず,増強電場と相互作用しやすく配向したPC10S-AuNP(粒径15-80 nm)を調製し,この溶液が最大で15倍もの発光増強を示すことを観測した.この強い発光は,高配向による効果と推測される.また,LB法により粒子膜を作製した結果,SPとPC10Sの励起子の強い相互作用が示唆された,強いLSPRを発現するAuNPの機能化と簡便な固定化法の確立に成功したことは,SPの実用化へ大きく貢献できる成果であると確信している.

  • 可視円偏光とプラズモニックナノ構造体の相互作用による磁化機構の解明

    2023.4 - 2024.3

    所長裁量経費による研究教育活動支援 

    石田拓也,伊知地直樹

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    Authorship：Principal investigator 

 

Media Coverage

  • DLXデザインラボ：未来の材料「メタマテリアル」につながる光ナノ加工技術の紹介動画を公開

    東京大学生産技術研究所プレスリリース  https://www.iis.u-tokyo.ac.jp/ja/news/4266/?utm_source=twitter&utm_medium=social&utm_campaign=update  2023.8

Academic Activities

  • Symmetry Breaking and Electromagnetic Metamaterials

    Planning, management, etc.,　Panel moderator, session chair, etc.

    2025.5

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    Type：Academic society, research group, etc. 

  • 磁性薄膜の磁気物性とデバイス応用 ～磁気工学からスピントロニクスへ～

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    石田拓也、立間徹  （ 東京 ） 2024.10

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  • 先端光機能材料シンポジウム2023

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    石田拓也, 高橋幸奈  （ 福岡 ） 2023.12

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