Faculty Members

Associate Professor
KOBAYASHI, Hirokazu

Year of birth: 1982
Gender: Male
Affiliation:

- School of Systems Engineering
- Electronic and Photonic Systems Engineering Course, Department of Engineering, Graduate School of Enginering

Areas of specialization
Laboratory/research office	Laboratory of Light Control and Optical Network We study about ultrahigh capacity optical network using MIMO (Multiple-Input Multiple-Output) technology and high precision non-invasive optical measurement including optical coherence tomography (OCT) and fiber sensing.
Current research topics
Educational background
Professional background
Licenses
Academic societies

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Courses

* Courses provided in English are shown with (E) mark

Undergraduate school	Introduction to Communication Systems Introduction to Communication Technologies Experiments of Electronic and Photonic 1 Graduation Thesis Experiments of Electronic and Photonic 2 Introduction to Electromagnetic and Optical Waves
Graduate school	Seminar 1 Seminar 2 Individual Work for Graduate Advanced Seminar 1 Advanced Seminar 2 Advanced Applied Mathematics II

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Research activities

Research papers	Authors: Zangpo Jigme, Tomohiro Kawabe, Hirokazu Kobayashi Title: Edge-enhanced microscopy of complex objects using scalar and vectorial vortex filtering Journal: Optics Express, Vol. 31, No. 23, pp. 38388-38399, Optica Year: 2023 Authors: Gianluca Ruffato, Samuele Brunetta, Hirokazu Kobayashi Title: A general conformal framework for regular cusp beams Journal: Optics Communications, Vol. 517, p. 128325, Elsevier Year: 2022 Authors: Kazuhisa Ogawa, Natsuki Abe, Hirokazu Kobayashi, Akihisa Tomita Title: Complex counterpart of variance in quantum measurements for pre- and postselected systems Journal: Physical Review Research, Vol. 3, p. 033077, American Physical Society Year: 2021 Authors: Kazuhisa Ogawa, Takumi Okazaki, Hirokazu Kobayashi, Toshihiro Nakanishi, Akihisa Tomita Title: Direct measurement of ultrafast temporal wavefunctions Journal: Optics Express, Vol. 29, No. 13, pp. 19403-19416, The Optical Society Year: 2021 Authors: Gianluca Ruffato, Hirokazu Kobayashi Title: Roulette caustics in transformation optics of structured light beams Journal: Optics Communications, Vol. 490, pp. 126893-1-126893-8, Elsevier Year: 2021 Authors: Mohamed El Ketara, Hirokazu Kobayashi, Etienne Brasselet Title: Sensitive vectorial optomechanical footprint of light in soft condensed matter Journal: Nature Photonics, Vol. 15, pp. 121-124, Springer Nature Year: 2020 Authors: Kazuhisa Ogawa, Hirokazu Kobayashi, Akihisa Tomita Title: Operational formulation of weak values without probe systems Journal: Physical Review A, Vol. 101, No. 4, pp. 042117-1-042117-12, American Physical Society Year: 2020 Authors: Satoru Takashima, Hirokazu Kobayashi, Katsushi Iwashita Title: Integer multiplier for the orbital angular momentum of light using a circular-sector transformation Journal: Physical Review A, Vol. 100, No. 6, pp. 063822-1-063822-14, American Physics Society Year: 2019 Authors: Kazuhisa Ogawa, Osamu Yasuhiko, Hirokazu Kobayashi, Toshihiro Nakanishi, Akihisa Tomita Title: A framework for measuring weak values without weak interactions and its diagrammatic representation Journal: New Journal of Physics, Vol. 21, No. 4, p. 043013, IOP Publishing Year: 2019 Authors: Kazuhisa Ogawa, Hirokazu Kobayashi, Akihisa Tomita Title: Classical reconstruction of interference patterns of position-wave-vector–entangled photon pairs by the time-reversal method Journal: Physical Review A, Vol. 97, No. 2, pp. 023823-1-023823-10 Year: 2018 Authors: Mikko Tukiainen, Hirokazu Kobayashi, Yutaka Shikano Title: Quantification of concurrence via weak measurement Journal: Physical Review A, Vol. 95, p. 052301 Year: 2017 Authors: Badar Mudabbir, KOBAYASHI Hirokazu, IWASHITA Katsushi Title: Chromatic dispersion measurement with double sideband phase noise canceled OFDR Journal: Optics Communications, Vol. 356, pp. 350-355 Year: 2015 Authors: Yusuf Turek, Hirokazu Kobayashi, Tomotada Akutsu, Chang-Pu Sun, Yutaka Shikano Title: Post-selected von Neumann measurement with Hermite–Gaussian and Laguerre–Gaussian pointer states Journal: New Journal of Physics, Vol. 17, p. 083029, IOP Institute of Physics Year: 2015 Authors: Kazuhisa Ogawa, Shuhei Tamate, Hirokazu Kobayashi, Toshihiro Nakanishi, Masao Kitano Title: Observation of nonlinear variations in a three-vertex geometric phase in a two-photon polarization qutrit Journal: Physical Review A, Vol. 91, p. 062118, American Physical Society Year: 2015 Authors: Kazuhisa Ogawa, Shuhei Tamate, Toshihiro Nakanishi, KOBAYASHI Hirokazu, Masao Kitano Title: Classical realization of dispersion cancellation by time-reversal method Journal: Physical Review A, Vol. 91, p. 013846, American Physical Society Year: 2015 Authors: KOBAYASHI Hirokazu, NONAKA Koji, YUTAKA Shikano Title: Stereographical visualization of a polarization state using weak measurements with an optical-vortex beam Journal: Physical Review A, Vol. 89, p. 053816 Year: 2014 Authors: Kazuhisa Ogawa, Shuhei Tamate, Hirokazu Kobayashi, Toshihiro Nakanishi, Masao Kitano Title: Time-reversed two-photon interferometry for phase　superresolution Journal: Physical Review A, Vol. 88, p. 063813 Year: 2013 Authors: LU　Mifang, KOBAYASHI Hirokazu, NONAKA Koji Title: Polarization-Stabilized Pulse Correlation Measurement for Remote Fiber Sensing Using Polarization Scrambled Pulses Journal: Japanese Journal of Applied Physics, Vol. 52, pp. 126603-1-126603-8 Year: 2013 Authors: LU　Mifang, NONAKA Koji, KOBAYASHI Hirokazu, Yang Jun, Yuan Libo Title: Quasi-distributed region selectable gas sensing for long　distance pipeline maintenance Journal: Measurement Science and Technology, Vol. 24, No. 9, p. 095104 Year: 2013 Authors: KOBAYASHI Hirokazu, PUENTES Graciana, SHIKANO Yutaka Title: Extracting joint weak values from two-dimensional spatial　displacements Journal: Physical Review A, Vol. 86, pp. 053805-1-053805-4 Year: 2012 Authors: NONAKA Koji, KOBAYASHI Hirokazu, Toshimasa Tszuki, Yuhei Masaoka, Xunjian Xu Title: Suppression of instability on sensing signal of optical pulse correlation measurement in remote fiber sensing Journal: Ｊｏｕｒｎａｌ　ｏｆ　Ｓｅｎｓｏｒｓ, Vol. 2012, pp. 107847-107853, Hindawi Publishing　Ｃｏｒｐｏｒａｔｉｏｎ Year: 2012 Authors: NONAKA Koji, KOBAYASHI Hirokazu, 北野　正雄 Title: Helical mode conversion using conical reflector Journal: Optics Express, Vol. 20, No. 13, pp. 14064-14074, Optical Society of America(OSA) Year: 2012 Authors: H. Kobayashi, Y. Ikeda, S. Tamate, T. Nakanishi, M. Kitano Title: Nonlinear behavior of geometric phases induced by photon pairs Journal: Phys. Rev. A, Vol. 83, p. 063808 Year: 2011 Authors: H. Kobayashi, S. Tamate, T. Nakanishi, K. Sugiyama, M. Kitano Title: Direct observation of geometric phases without state evolution Journal: AIP Conference Proceedings (QCMC), Vol. 1363, pp. 373-376 Year: 2011 Authors: H. Kobayashi, S. Tamate, T. Nakanishi, K. Sugiyama, M. Kitano Title: Observation of geometric phases in quantum erasers Journal: J. Phys. Soc. Jpn., Vol. 80, p. 034401 Year: 2011 Authors: H. Kobayashi, S. Tamate, T. Nakanishi, K. Sugiyama, M. Kitano Title: Direct observation of geometric phases using a three-pinhole interferometer Journal: Phys. Rev. A, Vol. 81, p. 012104 Year: 2010 Authors: T. Nakanishi, H. Kobayashi, K. Sugiyama, M. Kitano Title: Full Quantum Analysis of Two-Photon Absorption Using Two-Photon Wave Function: Comparison of Two-Photon Absorption with One-Photon Absorption Journal: J. Phys. Soc. Jpn., Vol. 78, p. 104401 Year: 2009 Authors: S. Tamate, H. Kobayashi, T. Nakanishi, K. Sugiyama, M. Kitano Title: Geometrical aspects of weak measurements and quantum erasers Journal: New. J. Phys., Vol. 11, p. 093025 Year: 2009 Authors: T. Nakanishi, K. Sakemi, H. Kobayashi, K. Sugiyama, M. Kitano Title: Two-Photon Interference of Photon Pairs Created in Photonic Crystal Fibers Journal: J. Phys. Soc. Jpn., Vol. 78, p. 024402 Year: 2009
Invited lectures	Spatical Mode Control of Optical Vortex through Geometric Transformation, 2023 Information Photonics Conference, Paus Landis Resort Wulai, New Taipei, Taiwan, 2023 Imprinting optical spin texture into liquid crystals, International Conference on Quantum Liquid Crystals 2023 (QLC2023) , Hokkaido University, 2023 Optical Torque in Liquid Crystal induced by Three-Dimensional Vectorial Characteristic of Optical Field, 2021 Integer Multiplier of Optical Orbital Angular Momentum using Spatial Light Modulator, Technical Committee on Photonic Network, zoom, 2021
Awards	Physical Review A, Editor's Suggestion [Phys. Rev. A, 89, 053816 (2014)], American Physical Society, 2014 Physical Review A, Editor's Suggestion [Phys. Rev. A, 88, 063813 (2013)], American Physical Society, 2013 JPSJ Editor's Choice [J. Phys. Soc. Jpn., Vol.80, 034401 (2011)], The Physical Society of Japan, 2011
Grants-in-Aid for Scientific Research from the Japanese government	Project title: Generation of higher-order helical beam for spatial mode mulplexing by using conical reflector Category: Grant-in-Aid for Young Scientists (B) Project number: 25790068 Project period: 2013-2014 Total budget amount: 4,420,000 yen Keywords: Project title: Visualization of Gouy phase of higher order Laguerre Gauss mode and its application to optical measurement Category: Grant-in-Aid for Early-Career Scientists Project number: 18K14151 Project period: 2018-2019 Total budget amount: 4,160,000 yen Keywords: Project title: Mode conversion of Laguerre Gaussian beam with radial mode by geometric transformation Category: Grant-in-Aid for Scientific Research (C) Project number: 20K05364 Project period: 2020-2022 Total budget amount: 4,420,000 yen Keywords: Project title: Multi-core fiber sensing using geometrical phase nonlinearity of optical polarization Category: Grant-in-Aid for Scientific Research (C) Project number: 23K04616 Project period: 2023-2025 Total budget amount: 4,680,000 yen Keywords:

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