Researcher Database

Researcher Profile and Settings

Master

Affiliation (Master)

  • Research Institute for Electronic Science Photonics and Optical Science

Affiliation (Master)

  • Research Institute for Electronic Science Photonics and Optical Science

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Profile and Settings

Affiliation

  • Hokkaido University, Research Institute for Electronic Science, Assistant Professor

Degree

  • Ph. D.(2017/03 The Graduate University for Advanced Studies)

Profile and Settings

  • Name (Japanese)

    Hashiyada
  • Name (Kana)

    Shun
  • Name

    201401073182742290

Affiliation

  • Hokkaido University, Research Institute for Electronic Science, Assistant Professor

Achievement

Research Interests

  • 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 Areas

  • 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

Research Experience

  • 2023/04 - Today Hokkaido University Research Institute for Electronic Science Assistant Professor
  • 2022/04 - 2023/03 Chuo University
  • 2019/04 - 2022/03 RIKEN Special post-doctoral researcher
  • 2019/06 - 2019/06 University of Glasgow School of Chemistry Visiting Researcher
  • 2017/04 - 2019/03 Institute for Molecular Science Postdoctoral Fellow
  • 2015/04 - 2017/03 Japan Society for the Promotion of Science (JSPS) Research Fellow (DC2)
  • 2016/07 - 2016/08 University of Glasgow School of Chemistry Visiting Student
  • 2015/11 - 2015/12 University of Glasgow School of Chemistry Visiting Student
  • 2014/10 - 2015/03 Institute for Molecular Science IMS Scholarship Student
  • 2014/09 - 2014/12 University of Glasgow School of Chemistry Visiting Student

Education

  • 2012/04 - 2017/03  The Graduate University for Advanced Studies  School of Physical Science  Department of Structural Molecular Science
  • 2007/04 - 2011/03  National Defense Academy  Department of Applied Physics

Awards

  • 2017/09 The Graduate University for Advanced Studies (sokendai) Research Award of The Graduate University for Advanced Studies (sokendai)
     
    受賞者: Shun Hashiyada
  • 2016/10 Student Award, OSJ-OSA Joint Symposia on Plasmonics and Digital Photonics
  • 2016/09 The Best Poster Presentation Award, The 14th International Conference on Near-Field Optics, Nanophotonics and Related Techniques (NFO-14)
     
    受賞者: Shun Hashiyada
  • 2015/10 Best Poster Awards at the Annual Meeting of the Japan Society for Molecular Science
     
    受賞者: Shun Hashiyada
  • 2015/04 The Chemical Society of Japan Student Presentation Award 2015
     
    受賞者: Shun Hashiyada
  • 2014/03 Tokai Branch of the Chemical Society of Japan Outstanding Student Prize
     
    受賞者: Shun Hashiyada
  • 2014/02 Asian CORE Winter School Outstanding Oral Award 2014
     
    受賞者: Shun Hashiyada
  • 2013/11 The Optical Society of Japan Optics & Photonics Japan Best Presentation Award 2013
     
    受賞者: Shun Hashiyada

Published Papers

  • Shun Hashiyada, Yoshito Y. Tanaka
    Review of Scientific Instruments 95 (5) 053101  0034-6748 2024/05/01 [Refereed][Not invited]
     
    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.
  • Kensaku Endo, Shun Hashiyada, Tetsuya Narushima, Yoshihiko Togawa, Hiromi Okamoto
    The Journal of Chemical Physics 159 (23) 0021-9606 2023/12/19 [Refereed]
     
    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.
  • 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 2330-4022 2022/10/20 [Refereed]
  • Junsuke Yamanishi, Hyo-Yong Ahn, Hidemasa Yamane, Shun Hashiyada, Hajime Ishihara, Ki Tae Nam, Hiromi Okamoto
    Science Advances 8 (38) eabq2604  2022/09/23 [Refereed]
     
    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.
  • Junsuke Yamanishi, Hyo-Yong Ahn, Shun Hashiyada, Hiromi Okamoto
    Proceedings of SPIE - The International Society for Optical Engineering 11522 1996-756X 2020 
    Optical trapping of nanoparticles is realized by optical gradient force originated from the intensity gradient of light with a focused beam. It is expected that the gradient force depending on the circular polarization (CP) acts on particles with chiral structures. Here, we investigate the CP-dependent gradient force on the chiral gold nanoparticles. We found that the amplitude (dispersion of the position of the Brownian motion) depends on the handedness of the incident light in both cases of D- and L-form particles. Based on the results on the gradient force for the chiral particles, it is expected that chiral nanomaterials can be handled by the circularly polarized light.
  • 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 1932-7447 2019/05 [Refereed][Not invited]
     
    Chiral plasmonic nanostructures enable <= pg detection and characterization of biomaterials. The sensing capabilities are associated with the chiral asymmetry of the near fields, which locally can be greater than equivalent circularly polarized light, a property referred to as superchirality. However, sensing abilities do not simply scale with the magnitude of superchirality. We show that chiral molecular sensing is correlated to the thickness of a nanostructure. This observation is reconciled with a previously unconsidered interference mechanism for the sensing phenomenon. It involves the "dissipation" of optical chirality into chiral material currents through the interference of fields generated by two spatially separated chiral modes. The presence of a chiral dielectric causes an asymmetric change in the phase difference, resulting in asymmetric changes to chiroptical properties. Thus, designing a chiral plasmonic sensor requires engineering a substrate that can sustain both superchiral fields and an interference effect.
  • Shun Hashiyada, Kensaku Endo, Tetsuya Narushima, Yoshihiko Togawa, Hiromi Okamoto
    Journal of Physics: Conference Series 1220 (1) 012050  1742-6588 2019/05 [Refereed][Not invited]
     
    © Published under licence by IOP Publishing Ltd. The surface-enhanced chiral-optical spectroscopy is based on the interaction of chiral molecules with chiral electromagnetic near field localized on a chiral plasmonic nanostructure. It is of fundamental importance to reveal the spectral characteristics of chiral near fields for maximizing the chiral interaction. Here we investigate relations between near field and far field polarization characteristics of the chiral plasmonic nanostructures, using electromagnetic simulations. We found that spectral features of chiral near fields created by the nanostructures intercorrelate with those of far field optical rotation. This finding may provide us a method to characterize and design the chiral near field.
  • Shun Hashiyada, Tetsuya Narushima, Hiromi Okamoto
    ACS Photonics 6 (3) 677 - 683 2330-4022 2019/01 [Refereed][Not invited]
     
    Chiral optical fields (typified by circularly polarized light) localized on the nanoscale enhance the chiral light-matter interaction, which may provide novel potential applications. This property enables the development of an ultrasensitive method for characterization of chiral molecules and nanoscale magnetic control realized by an all-optical method to interconnect spintronic nano-optical devices. A local chiral light source with switchable handedness or controllable chirality is indispensable for building such applications for practical use. In the current major method used for local chiral light generation, the handedness of the light is controlled by the handedness of the nanomaterial, which is not convenient when we need to change the handedness of the light. We experimentally achieve here generation and active control of a highly chiral local optical field by using a combination of an achiral gold nanorod and achiral linearly polarized optical field. By tilting the azimuth angle for the incident linear polarization relative to the axis of the nanorod, either left- or right-handed circularly polarized local optical fields can be generated. Our work may give us a chance to pioneer analytical applications of chiral optical fields and novel spintronic nano-optical devices.
  • Khai Q Le, Shun Hashiyada, Masaharu Kondo, Hiromi Okamoto
    The Journal of Physical Chemistry C 122 (43) 24924 - 24932 1932-7447 2018/10 [Refereed][Not invited]
  • 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 2018/08 [Refereed][Not invited]
  • Motoko Okumoto, Shun Hashiyada, Akihiro Takahashi, Nyubo Abe
    Journal of Science Education in Japan 42 131 - 139 2018/07 [Refereed][Not invited]
  • Shun Hashiyada, Tetsuya Narushima, Hiromi Okamoto
    ACS Photonics 5 (4) 1486 - 1492 2330-4022 2018/04/18 [Refereed][Not invited]
     
    Chiral systems (consisting of materials and incident radiation) respond differently to left- and right-handed circularly polarized light macroscopically. As a consequence, only chiral materials show intrinsic macroscopic optical activity, and only chiral systems generate circularly polarized light from linearly polarized incident light. In the nanoscopic regime, in contrast to this general rule for macroscopic cases, it is theoretically expected that achiral (nonchiral) systems can locally generate circularly polarized fields. Here, we report experimental evidence for that situation in achiral systems consisting of gold nanostructures and linearly polarized incident light. The local circularly polarized fields were visualized by near-field polarimetry imaging, and the spatial features of the observed circularly polarized fields were qualitatively reproduced by a simple dipole model. The present results may provide a novel technique to produce controllable circularly polarized optical fields in nanospaces.
  • Tetsuya Narushima, Shun Hashiyada, Hiromi Okamoto
    CHIRALITY 28 (7) 540 - 544 0899-0042 2016/07 [Refereed][Not invited]
     
    Chiral nanostructures show macroscopic optical activity. Local optical activity and its handedness are not uniform in the nanostructure, and are spatially distributed depending on the shape of the nanostructure. In this study we fabricated curved chain nanostructures made of gold by connecting linearly two or more arc structures in a two-dimensional plane. Spatial features of local optical activity in the chain structures were evaluated with near-field circular dichroism (CD) imaging, and analyzed with the aid of classical electromagnetic simulation. The electromagnetic simulation predicted that local optical activity appears at inflection points where arc structures are connected. The handedness of the local optical activity was dependent on the handedness of the local chirality at the inflection point. Chiral chain structures have odd inflection points and the local optical activity distributed symmetrically with respect to structural centers. In contrast, achiral chain structures have even inflection points and showed antisymmetric distribution. In the near-field CD images of fabricated chain nanostructures, the symmetric and antisymmetric distributions of local CD were observed for chiral and achiral chain structures, respectively, consistent with the simulated results. The handedness of the local optical activity was found to be determined by the handedness of the inflection point, for the fabricated chain structures having two or more inflection points. The local optical activity was thus governed primarily by the local chirality of the inflection points for the gold chain structures. The total effect of all the inflection points in the chain structure is considered to be a predominant factor that determines the macroscopic optical activity. (C) 2016 Wiley Periodicals, Inc.
  • Narushima T., Hashiyada S., Okamoto H.
    Meeting Abstracts of the Physical Society of Japan 一般社団法人日本物理学会 70 1149 - 1149 2189-079X 2015
  • Shun Hashiyada, Tetsuya Narushima, Hiromi Okamoto
    JOURNAL OF PHYSICAL CHEMISTRY C 118 (38) 22229 - 22233 1932-7447 2014/09 [Refereed][Not invited]
     
    Since Pasteur's discovery of molecular chirality, which means that the molecule has a nonsuperposable mirror image, the geometrical chirality of a material has been considered the prerequisite for exhibiting circular dichroism (CD, defined as the differential absorption of left and right circularly polarized light) of the structural origin. Here, we report an experimental demonstration of nanoscale local CD activities for achiral (nonchiral) rectangular gold nanostructures. Macroscopic CD spectral measurements of the nanostructure sample did not show any CD activity over the entire range of measured wavelengths, as expected from the achiral shape of the rectangle. In contrast, we found both locally positive and negative CD signals in a single rectangular nanostructure, whose distribution was symmetric about the center of the rectangle, with large CD signals at the corners. The results demonstrate that the established selection rule of optical activity is not valid for local microscopic measurements.
  • Tetsuya Narushima, Shun Hashiyada, Hiromi Okamoto
    ACS PHOTONICS 1 (8) 732 - 738 2330-4022 2014/08 [Refereed][Not invited]
     
    We studied the correlation between the geometry and the local optical activity of an "S"-shaped chiral nanostructure composed of two associating achiral "C"-shaped partial structures as one way to elucidate how optical activity develops with the formation of a chiral structure. This chirality formation process models the formation of chiral molecules by association of achiral atoms or functional groups. The local optical activities induced by the association of the achiral nanostructures were investigated using a circular dichroism (CD) nanoimaging technique. The chirality formed with the two approaching achiral partial structures caused enhancement of the local optical activity around the region of their connection when the distance between the achiral partial structures was less than 350 nm. The local optical activity was enhanced even without physical contact of the two partial structures. We therefore concluded that long-range electromagnetic interaction, rather than electronic exchange between the two partial structures, made a major contribution to the optical activity of the chiral nanostructure.
  • Tetsuya Narushima, Shun Hashiyada, Hiromi Okamoto
    HYOMENKAGAKU 公益社団法人 日本表面科学会 35 (6) 312 - 318 0388-5321 2014/06 [Refereed][Not invited]
     
    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.

MISC

  • 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-  2018/10  [Not refereed][Not invited]
     
    © 2018 OSJ We investigate relations between near field and far field polarization characteristics of the chiral plasmonic nanostructures, using electromagnetic simulations. We found that the spectral features of chiral near fields created by the nanostructures intercorrelate with those of far field optical rotation. This finding may provide us a method to characterize the chiral near field.
  • Shun Hashiyada, Tetsuya Narushima, Hiromi Okamoto  Proceedings of SPIE - The International Society for Optical Engineering  10712-  107121S  2018  [Not refereed][Not invited]
     
    We demonstrate here that control of local optical field near a single non-chiral gold nano-rectangle irradiated with linearly polarized light is possible from linearly polarized to nearly pure left- or right-handed circular polarization, by adjusting the angle of the incident polarization relative to the rectangle.
  • 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-  2017/09  [Not refereed][Not invited]
  • Shun Hashiyada, Tetsuya Narushima, Hiromi Okamoto  OPTICAL MANIPULATION CONFERENCE  10252-  1025214  2017  [Not refereed][Not invited]
     
    We experimentally demonstrate that non-chiral plasmonic nanostructured materials interacting with linearly polarized (non-chiral) light generate elliptically polarized (chiral) optical near-fields in local nano spaces around the materials.

Presentations

Teaching Experience

  • Experiments 2 (Optical rotation of chiral molecules)Experiments 2 (Optical rotation of chiral molecules) Hokkaido University
  • Freshman Seminar "Science in our daily life" (The science of chirality)Freshman Seminar "Science in our daily life" (The science of chirality) Hokkaido University
  • Electronics and Information Engineering ExercisesElectronics and Information Engineering Exercises Hokkaido University
  • NanophotonicsNanophotonics Hokkaido University

Association Memberships

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

Research Projects

  • Japan Society for the Promotion of Science:Grants-in-Aid for Scientific Research
    Date (from‐to) : 2023/04 -2026/03 
    Author : Shun Hashiyada
  • 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
    日本学術振興会:科研費(若手研究)
    Date (from‐to) : 2021/04 -2023/03
  • キラル磁気プラズモニクスの開拓
    自然科学研究機構新分野創成センター:先端光科学研究プロジェクト
    Date (from‐to) : 2021/08 -2022/03 
    Author : 橋谷田俊 戸川欣彦
  • Chiroptical Spectroscopy of Molecules Captured by Plasmonic Optical Tweezers
    Japan Society for the Promotion of Science:Grant-in-Aid for Early-Career Scientists
    Date (from‐to) : 2019/04 -2021/03 
    Author : Shun Hashiyada
  • Ultrasensitive detection of chiral molecules using highly symmetric metal nanostructures and linearly polarized light
    Japan Society for the Promotion of Science:Grant-in-Aid for Research Activity start-up
    Date (from‐to) : 2017/08 -2019/03 
    Author : Shun Hashiyada
  • Japan Society for the Promotion of Science:Grants-in-Aid for Scientific Research
    Date (from‐to) : 2015/04 -2019/03 
    Author : 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:Grants-in-Aid for Scientific Research
    Date (from‐to) : 2015/04 -2017/03 
    Author : 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.
  • Development for Chiral Photochemical Reaction Fields Using Strong Local Optical Activity of Gold Nanostructures
    JSPS:Grant-in-Aid for Scientific Research
    Date (from‐to) : 2015/04 -2017/03 
    Author : Shun Hashiyada
  • Japan Society for the Promotion of Science:Grants-in-Aid for Scientific Research
    Date (from‐to) : 2010/04 -2015/03 
    Author : 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.

Social Contribution

  • Date (from-to) : 2013/09/14-2015/11/07
    Role : Appearance
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