Hashiyada Shun

Research Institute for Electronic Science　Photonics and Optical ScienceAssistant Professor
Last Updated :2025/06/08

■Researcher basic information

Degree

  • Ph. D., The Graduate University for Advanced Studies, Mar. 2017

Researchmap personal page

Home Page URL

J-Global ID

Research Keyword

  • Optical chirality（Lipkin's Zilch）
  • Orbital angular momentum
  • Spin angular momentum
  • Optical angular momentum
  • Helical dichroism
  • Vortex dichroism
  • Circular dichroism
  • Optical vortex
  • 円偏光発光
  • 偏光解析
  • 光物性
  • ナノ光学
  • Nanostructures
  • Optical Activity
  • Chirality
  • Scanning Near-field Optical Microscope
  • Plasmon
  • Physical Chemistry

Research Field

  • Nanotechnology/Materials, Applied physics - general
  • Nanotechnology/Materials, Analytical chemistry
  • Natural sciences, Mathematical physics and basic theory
  • Nanotechnology/Materials, Basic physical chemistry
  • Natural sciences, Semiconductors, optical and atomic physics

Educational Organization

■Career

Career

  • Apr. 2023 - Present
    Hokkaido University, Research Institute for Electronic Science, Assistant Professor
  • Apr. 2022 - Mar. 2023
    Chuo University, 科研費研究員
  • Apr. 2019 - Mar. 2022
    RIKEN, Special post-doctoral researcher
  • Jun. 2019 - Jun. 2019
    University of Glasgow, School of Chemistry, Visiting Researcher
  • Apr. 2017 - Mar. 2019
    Institute for Molecular Science, Postdoctoral Fellow
  • Apr. 2015 - Mar. 2017
    Japan Society for the Promotion of Science (JSPS), Research Fellow (DC2)
  • Jul. 2016 - Aug. 2016
    University of Glasgow, School of Chemistry, Visiting Student
  • Nov. 2015 - Dec. 2015
    University of Glasgow, School of Chemistry, Visiting Student
  • Oct. 2014 - Mar. 2015
    Institute for Molecular Science, IMS Scholarship Student
  • Sep. 2014 - Dec. 2014
    University of Glasgow, School of Chemistry, Visiting Student

Educational Background

  • Apr. 2012 - Mar. 2017, The Graduate University for Advanced Studies, School of Physical Science, Department of Structural Molecular Science
  • Apr. 2007 - Mar. 2011, National Defense Academy, 理工学専攻, Department of Applied Physics

■Research activity information

Awards

  • Sep. 2017, The Graduate University for Advanced Studies (sokendai), Research Award of The Graduate University for Advanced Studies (sokendai)　　　　　　　　　　　　　　　
    Shun Hashiyada
  • Oct. 2016, Student Award, OSJ-OSA Joint Symposia on Plasmonics and Digital Photonics　　　　　　　　　　　　　　　
  • Sep. 2016, The Best Poster Presentation Award, The 14th International Conference on Near-Field Optics, Nanophotonics and Related Techniques (NFO-14)　　　　　　　　　　　　　　　
    Shun Hashiyada, International society
  • Oct. 2015, Best Poster Awards at the Annual Meeting of the Japan Society for Molecular Science　　　　　　　　　　　　　　　
    Shun Hashiyada, Japan society, Japan
  • Apr. 2015, The Chemical Society of Japan, Student Presentation Award 2015　　　　　　　　　　　　　　　
    Shun Hashiyada, Japan society
  • Mar. 2014, Tokai Branch of the Chemical Society of Japan, Outstanding Student Prize　　　　　　　　　　　　　　　
    Shun Hashiyada, Japan society
  • Feb. 2014, Asian CORE Winter School, Outstanding Oral Award 2014　　　　　　　　　　　　　　　
    Shun Hashiyada, International society
  • Nov. 2013, The Optical Society of Japan, Optics & Photonics Japan Best Presentation Award 2013　　　　　　　　　　　　　　　
    Shun Hashiyada, Japan society

Papers

  • Conservation law for angular momentum based on optical field derivatives: Analysis of optical spin-orbit conversion
    Shun Hashiyada, Yoshito Y. Tanaka
    Physical Review Research, 7, 2, American Physical Society (APS), 04 Jun. 2025, [Peer-reviewed], [Lead author, Corresponding author]
    English, Scientific journal, We present a theoretical framework for analyzing the loss of optical angular momentum (AM), including spin AM (SAM) and orbital AM (OAM) components, in light-matter interactions. Conventional SAM and OAM conservation laws rely on transverse field components, neglecting longitudinal fields and limiting applicability to a vacuum. Our approach defines optical AM using time derivatives of the electric and magnetic fields, yielding a gauge-invariant formulation that includes both transverse and longitudinal components and explicitly incorporates charge and current densities into SAM and OAM conservation laws. This enables a more complete description of AM dissipation in materials. We apply this framework to analyze spin-orbit conversion (SOC) in two scenarios: the scattering of circularly polarized (CP) Gaussian beams by a gold nanoparticle and focusing of CP Gaussian beams and linearly polarized optical vortex beams by a lens. The results show that SOC depends on particle size and polarization, with notable OAM loss in larger particles and CP Gaussian beam focusing. This framework enables the evaluation of previously overlooked SAM and OAM losses, providing a powerful tool for studying systems in which the analysis of AM losses is intrinsically important, such as chiral materials, as well as for designing photonic devices and exploring light-matter interactions at the nanoscale.

    Published by the American Physical Society 2025
  • Rapid modulation of left- and right-handed optical vortices for precise measurements of helical dichroism
    Shun Hashiyada, Yoshito Y. Tanaka
    Review of Scientific Instruments, 95, 5, 053101, AIP Publishing, 01 May 2024, [Peer-reviewed], [Lead author, Corresponding author]
    Scientific journal, Helical dichroism (HD), which is defined as the difference in optical absorption between chiral pairs of lights involving left-handed (LH) and right-handed (RH) optical vortices (OVs) carrying orbital angular momentum (OAM), is a promising way to characterize chiral materials. In the current major methods of OV generation using spatial light modulators (SLMs), the speed of OAM switching is typically as slow as 100 Hz, which is comparable to low-frequency noise, making precise chiral detection difficult. Here, we theoretically propose and experimentally demonstrate a rapid modulation of the LH and RH OVs at around 50 kHz. This modulation is achieved through a rapid modulation of circularly polarized lights carrying spin angular momentum (SAM), combined with a SAM–OAM conversion technique. We establish a theory not only for rapid OV modulation but also for HD measurements using the modulated OVs. We experimentally verify the theory using helical phase holograms drawn on a SLM as a pseudo-HD active sample. Our work addresses the limitations of current methods and offers a new avenue for precise HD measurements, paving the way for the development of sensitive chiral-optical spectroscopy techniques.
  • Circular dichroism of pseudo-two-dimensional metal nanostructures: Rotational symmetry and reciprocity
    Kensaku Endo, Shun Hashiyada, Tetsuya Narushima, Yoshihiko Togawa, Hiromi Okamoto
    The Journal of Chemical Physics, 159, 23, AIP Publishing, 19 Dec. 2023, [Peer-reviewed]
    English, Scientific journal, Circular dichroism (CD) spectra for pseudo-two-dimensional chiral nanomaterials were systematically investigated and analyzed in relation to the rotational symmetry of the nanomaterials. Theoretically, an ideal two-dimensional chiral matter is CD inactive for light incident normal to the plane if it possesses threefold or higher rotational symmetry. If the matter has two- or onefold rotational symmetry, it should exhibit CD activity, and the CD signal measured from the back side of the matter is expected to be inverted from that measured from the front side. For pseudo-two-dimensional chiral gold nanostructures fabricated on glass substrates using electron beam lithography, matter with fourfold rotational symmetry is found to be CD active, even when special care is taken to ensure that the optical environments for the front and back sides of the sample are equivalent. In this case, the CD signal measured from the back side is found to be almost exactly the same as that measured from the front side. It is revealed that the observed chiro-optical behavior arises from three-dimensional chiral characteristics due to differences in the surface shape between the front and back sides of the structures. For matter that is two- or onefold rotationally symmetric, the CD signal measured from the back side is not coincident with that from the front side. For certain wavelength regions, the CD signals measured from the front side and back side are observed to be similar, while at other wavelengths, the inverted component of the CD signals is found to dominate. The observed CD spectral behavior for reciprocal optical measurement configurations is considered to be determined by a balance between the in-plane isotropic and anisotropic components of the chiral permittivity.
  • Near-Field Probing of Optical Superchirality with Plasmonic Circularly Polarized Luminescence for Enhanced Bio-Detection
    Victor Tabouillot, Rahul Kumar, Paula L. Lalaguna, Maryam Hajji, Rebecca Clarke, Affar S. Karimullah, Andrew R. Thomson, Andrew Sutherland, Nikolaj Gadegaard, Shun Hashiyada, Malcolm Kadodwala
    ACS Photonics, American Chemical Society (ACS), 20 Oct. 2022, [Peer-reviewed]
    Scientific journal
  • Optical gradient force on chiral particles
    Junsuke Yamanishi, Hyo-Yong Ahn, Hidemasa Yamane, Shun Hashiyada, Hajime Ishihara, Ki Tae Nam, Hiromi Okamoto
    Science Advances, 8, 38, eabq2604, American Association for the Advancement of Science (AAAS), 23 Sep. 2022, [Peer-reviewed], [International Magazine]
    English, Scientific journal, When a chiral nanoparticle is optically trapped using a circularly polarized laser beam, a circular polarization (CP)–dependent gradient force can be induced on the particle. We investigated the CP-dependent gradient force exerted on three-dimensional chiral nanoparticles. The experimental results showed that the gradient force depended on the handedness of the CP of the trapping light and the particle chirality. The analysis revealed that the spectral features of the CP handedness–dependent gradient force are influenced not only by the real part of the refractive index but also by the electromagnetic field perturbed by the chiral particle resonant with the incident light. This is in sharp contrast to the well-known behavior of the gradient force, which is governed by the real part of the refractive index. The extended aspect of the chiral optical force obtained here can provide novel methodologies on chirality sensing, manipulation, separation, enantioselective biological reactions, and other fields.
  • Optical gradient force on Chiral nanoparticles
    Junsuke Yamanishi, Hyo-Yong Ahn, Shun Hashiyada, Hiromi Okamoto
    Proceedings of SPIE - The International Society for Optical Engineering, 11522, SPIE, 2020
    English, International conference proceedings
  • Roles of superchirality and interference in chiral plasmonic biodetection
    Cameron Gilroy, Shun Hashiyada, Kensaku Endo, Affar Shahid Karimullah, Laurence D. Barron, Hiromi Okamoto, Yoshihiko Togawa, Malcolm Kadodwala
    The Journal of Physical Chemistry C, 123, 24, 15195, 15203, May 2019, [Peer-reviewed], [Corresponding author]
    English, Scientific journal
  • Spectral properties of chiral electromagnetic near fields created by chiral plasmonic nanostructures
    Shun Hashiyada, Kensaku Endo, Tetsuya Narushima, Yoshihiko Togawa, Hiromi Okamoto
    Journal of Physics: Conference Series, 1220, 1, 012050, May 2019, [Peer-reviewed], [Lead author, Corresponding author]
    English, International conference proceedings
  • Active control of chiral optical near fields on a single metal nanorod
    Shun Hashiyada, Tetsuya Narushima, Hiromi Okamoto
    ACS Photonics, 6, 3, 677, 683, Jan. 2019, [Peer-reviewed], [Lead author, Corresponding author]
    English, Scientific journal
  • Circularly polarized photoluminescence from achiral dye molecules induced by plasmonic two-dimensional chiral nanostructures
    Khai Q Le, Shun Hashiyada, Masaharu Kondo, Hiromi Okamoto
    The Journal of Physical Chemistry C, 122, 43, 24924, 24932, American Chemical Society (ACS), Oct. 2018, [Peer-reviewed]
    English, Scientific journal
  • Nanoscale chiral surface relief of azo-polymers with nearfield OAM light
    Keigo Masuda, Ryo Shinozaki, Yoshinori Kinezuka, Junhyung Lee, Seigo Ohno, Shun Hashiyada, Hiromi Okamoto, Daisuke Sakai, Kenji Harada, Katsuhiko Miyamoto, Takashige Omatsu
    Optics Express, 26, 17, 22197, 22207, The Optical Society, Aug. 2018, [Peer-reviewed]
    English, Scientific journal
  • How an Understanding of the Nature of a Science Café Promotes a Joint Initiative Communication Style
    Motoko Okumoto, Shun Hashiyada, Akihiro Takahashi, Nyubo Abe
    Journal of Science Education in Japan, 42, 131, 139, Jul. 2018, [Peer-reviewed]
    Japanese, Scientific journal
  • Imaging Chirality of Optical Fields near Achiral Metal Nanostructures Excited with Linearly Polarized Light
    Shun Hashiyada, Tetsuya Narushima, Hiromi Okamoto
    ACS Photonics, 5, 4, 1486, 1492, American Chemical Society, 18 Apr. 2018, [Peer-reviewed], [Lead author]
    English, Scientific journal
  • Optical Activity Governed by Local Chiral Structures in Two-Dimensional Curved Metallic Nanostructures
    Tetsuya Narushima, Shun Hashiyada, Hiromi Okamoto
    CHIRALITY, 28, 7, 540, 544, Jul. 2016, [Peer-reviewed]
    English, Scientific journal
  • Local Optical Activity in Achiral Two-Dimensional Gold Nanostructures
    Shun Hashiyada, Tetsuya Narushima, Hiromi Okamoto
    JOURNAL OF PHYSICAL CHEMISTRY C, 118, 38, 22229, 22233, Sep. 2014, [Peer-reviewed], [Lead author]
    English, Scientific journal
  • Nanoscopic Study on Developing Optical Activity with Increasing Chirality for Two-Dimensional Metal Nanostructures
    Tetsuya Narushima, Shun Hashiyada, Hiromi Okamoto
    ACS PHOTONICS, 1, 8, 732, 738, Aug. 2014, [Peer-reviewed]
    English, Scientific journal
  • Strong Localized Optical Activity in Two-Dimensional Metal Nanostructures : Near-Field Circular Dichroism Imaging
    Tetsuya Narushima, Shun Hashiyada, Hiromi Okamoto
    HYOMENKAGAKU, 35, 6, 312, 318, The Surface Science Society of Japan, Jun. 2014, [Peer-reviewed]
    Japanese, Scientific journal, Nanostructures with chiral shapes show optical activity. The optical activity of the chiral nanostructure may be regarded approximately as an integration of contributions from optical activity of local sites over the entire nanostructure. In this article, we describe our recent experimental efforts to realize 100-nm-scale spatially resolved circular dichroism (CD) imaging. The results of CD imaging for S-shaped gold nanostructure are compared with the macroscopically obtained CD spectra. Local CD signals of both handednesses coexisted in the individual nanostructure, and the spatial distribution of the CD reflected the chiral symmetry of the nanostructure. When the local CD signal is integrated over the entire nanostructure, its value was approximately 1% of the maximum local CD signal, which roughly coincided with the macroscopic CD signal. This indicates that there are possibly prominent local CD signals even if only a tiny CD signal is observed in the macroscopic measurements of optical activity for nanostructured samples.

Other Activities and Achievements

  • Chiral Optical Responses
    Shun Hashiyada, Hiromi Okamoto, Solid state physics, 59, 11, 79, 94, Nov. 2024, [Peer-reviewed], [Invited], [Lead author, Corresponding author], [Domestic magazines]
    This article reviews the history and development of chirality in materials and light, highlighting key discoveries, the role of polarized light, and advancements in chiral optical responses. It covers fundamental principles and explores advanced research on chiral optical responses to circularly polarized light, chiral optical near­field, and optical vortices., AGNE Gijutsu Center, Japanese, Introduction other
  • Spectral properties of chiral electromagnetic near fields created by chiral plasmonic nanostructures
    Shun Hashiyada, Kensaku Endo, Tetsuya Narushima, Yoshihiko Togawa, Hiromi Okamoto, 2018 Joint Symposia on Optics (Optical Society of America, 2018), paper 30aCJ4, Part F125-OPJ 2018, Oct. 2018
    English, Introduction international proceedings
  • Active polarization control of optical fields localized on gold nano-rectangles
    Shun Hashiyada, Tetsuya Narushima, Hiromi Okamoto, Proceedings of SPIE - The International Society for Optical Engineering, 10712, 107121S, 2018
    SPIE, English, Introduction international proceedings
  • Imaging Chiral Plasmons
    Hiromi Okamoto, Shun Hashiyada, Yoshio Nishiyama, Tetsuya Narushima, SAP-OSA Joint Symposia 2017 Abstracts (Optical Society of America, 2017), paper 5a_A410_1, Part F78-JSAP 2017, Sep. 2017
    English, Introduction international proceedings
  • Generation of Chiral Optical Near-Fields with Non-Chiral Metallic Nanostructures and Linearly Polarized Light
    Shun Hashiyada, Tetsuya Narushima, Hiromi Okamoto, OPTICAL MANIPULATION CONFERENCE, 10252, 1025214, 2017
    English, Introduction international proceedings

Lectures, oral presentations, etc.

Courses

  • Bioengineering and Bioinformatics Laboratory II (Optical rotation of chiral molecules)　　　　　　　　　　　　　　　
    Hokkaido University
  • Freshman Seminar "Science in our daily life" (The science of chirality)　　　　　　　　　　　　　　　
    Hokkaido University
  • Electronics and Information Engineering Exercises　　　　　　　　　　　　　　　
    Hokkaido University
  • Nanophotonics　　　　　　　　　　　　　　　
    Hokkaido University

Affiliated academic society

  • Apr. 2024 - Present
    The Optical Society of Japan　　　　　　　　　　　　　　　
  • THE JAPAN SOCIETY OF APPLIED PHYSICS　　　　　　　　　　　　　　　
  • JAPAN SOCIETY FOR MOLECULAR SCIENCE　　　　　　　　　　　　　　　
  • 日本物理学会　　　　　　　　　　　　　　　

Research Themes

  • Creation of longitudinal chiral electromagnetic fields and detection of chiral materials
    Grants-in-Aid for Scientific Research
    Apr. 2023 - Mar. 2026
    Shun Hashiyada
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), Hokkaido University, Principal investigator, 23K04669
  • 禁制光検出による迅速なキラル近接場光スペクトル測定法の開発　　　　　　　　　　　　　　　
    科研費（若手研究）
    Apr. 2021 - Mar. 2023
    日本学術振興会, Principal investigator
  • キラル磁気プラズモニクスの開拓　　　　　　　　　　　　　　　
    先端光科学研究プロジェクト
    Aug. 2021 - Mar. 2022
    橋谷田俊 戸川欣彦
    自然科学研究機構新分野創成センター, Principal investigator
  • Chiroptical Spectroscopy of Molecules Captured by Plasmonic Optical Tweezers　　　　　　　　　　　　　　　
    Grant-in-Aid for Early-Career Scientists
    Apr. 2019 - Mar. 2021
    Shun Hashiyada
    Japan Society for the Promotion of Science, Principal investigator, Competitive research funding
  • Ultrasensitive detection of chiral molecules using highly symmetric metal nanostructures and linearly polarized light　　　　　　　　　　　　　　　
    Grant-in-Aid for Research Activity start-up
    Aug. 2017 - Mar. 2019
    Shun Hashiyada
    Japan Society for the Promotion of Science, Principal investigator, Competitive research funding
  • Development of Chiral Chemical Fields with Chiral Plasmons
    Grants-in-Aid for Scientific Research
    Apr. 2015 - Mar. 2019
    Okamoto Hiromi, NARUSHIMA Tetsuya, NISHIYAMA Yoshio, HASHIYADA Shun, LE Khai Quang, KADODWALA Malcolm, JACK Calum
    When a matter is not superposable on its mirror image, as in the case of right and left hands, the geometry of the matter is referred to as "chiral". Chirality is an important characteristic of molecules and nanomaterials. In this research, we developed and/or advanced the methods combining microscopy with optical activity spectroscopy, which characterizes molecular- and nano-level chirality, and we utilized them to investigate fundamental properties of local chirality of nanomaterials, and to apply the knowledge to develop novel chiral photo-chemical functions of materials. We have shown that local chirality properties of nanomaterials show fundamentally different behaviors as compared with those observed with conventional macroscopic optical activity spectroscopy. By the properly designed usage of noble metal nanostructures and polarized optical fields, we found that molecular- and/or nano-scale chirality can be induced on achiral materials systems.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A), Institute for Molecular Science, 15H02161
  • Control of magnetization with local circularly polarized field induced on metallic nanostructures
    Grants-in-Aid for Scientific Research
    Apr. 2015 - Mar. 2017
    OKAMOTO Hiromi, NARUSHIMA Tetsuya, NISHIYAMA Yoshio, HASHIYADA Shun
    We investigated whether inverse Faraday effect, which is potentially utilized as a basis for optical control of magnetic properties of materials, can be enhanced with metal nanostructures. When a material is irradiated with circularly polarized light, which possesses twisted (spiral) field structure, the material is slightly magnetized (this phenomenon is called as inverse Faraday effect). However, this effect is usually very small. Because strongly twisted circular polarized field is sometimes induced when a metallic nanostructure is shined with light, we considered that inverse Faraday effect may be enhanced by the strongly twisted field with metallic nanostructures, and explored the possible utility for control of magnetic properties with light. Up to now, we have succeeded in observing circularly-polarized-light induced magnetization. We will continue the efforts toward characterizing properties of enhanced inverse Faraday effects by changing the sample materials and conditions.
    Japan Society for the Promotion of Science, Grant-in-Aid for Challenging Exploratory Research, Institute for Molecular Science, 15K13683
  • Development for Chiral Photochemical Reaction Fields Using Strong Local Optical Activity of Gold Nanostructures　　　　　　　　　　　　　　　
    Grant-in-Aid for Scientific Research
    Apr. 2015 - Mar. 2017
    Shun Hashiyada
    JSPS, Principal investigator, Competitive research funding
  • Spatio-temporal characteristics and control of coupled excited states in nano-dot arrays
    Grants-in-Aid for Scientific Research
    Apr. 2010 - Mar. 2015
    OKAMOTO Hiromi, NARUSHIMA Tetsuya, IMURA Kohei, NISHIYAMA Yoshio, JIANG Yuqiang, LIM Jong Kuk, KOWAKA Yasuyuki, WU Hui Jun, HASHIYADA Shun
    This research aimed principally at revealing space-time structures of optical fields in metal nanostructures and plasmonic interactions that determine the field structures, through near-field optical imaging and analysis. We found characteristic optical field structures in 1- and 2-dimensional array structures of metal nanoparticles, and the results were intepreted in terms of a simple model of inter-particle interaction. We also obtained some intriguing results on ultrafast dynamics and other basic nano-optical characteristics of metal nanostructures. We further extend the research to studies on optical activity in nanospace. A novel near-field circular dichroism microscope was constructed, and local optical activity of metal nanostructures was visualized. We found that metal nanoparticles yield locally very strong optical activity, and that even highly symmetric achiral nanostructures gave local optical activity.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (S), Institute for Molecular Science, 22225002

Social Contribution Activities

  • 差の湯の会
    14 Sep. 2013 - 07 Nov. 2015
    Appearance, Informant
    Science cafe
    Others