Kotaro Imasaka

Profile Information

Affiliation: RIKEN

Degree: 博士（工学）(Jan, 2020, 東京大学大学院)
修士（工学）(Mar, 2015, 東京大学大学院)
学士（工学）(Mar, 2013, 東京大学)

ORCID ID: https://orcid.org/0000-0003-4361-8495
J-GLOBAL ID: 202001011732749967
researchmap Member ID: R000000850

Research Areas

Major Papers

High harmonic generation from GaSe in a deep-UV range well above the bandgap

Kotaro Imasaka, Yasushi Shinohara, Tomohiro Kaji, Keisuke Kaneshima, Nobuhisa Ishii, Jiro Itatani, Kenichi L. Ishikawa, Satoshi Ashihara

Optics Continuum, 1(5) 1232-1247, May 15, 2022 Peer-reviewedLead author
Excitation of multiple phonon modes in copper metaborate CuB2O4 via nonresonant impulsive stimulated Raman scattering

Imasaka, Kotaro, Pisarev, Roman, V, Bezmaternykh, Leonard N., Shimura, Tsutomu, Kalashnikova, Alexandra M., Satoh, Takuya

PHYSICAL REVIEW B, 98(5), Aug, 2018 Peer-reviewedLead author
Antenna-enhanced high harmonic generation in a wide-bandgap semiconductor ZnO

Imasaka, Kotaro, Kaji, Tomohiro, Shimura, Tsutomu, Ashihara, Satoshi

OPTICS EXPRESS, 26(16) 21364-21374, Aug, 2018 Peer-reviewedLead author
Polarization-Resolved Study of High Harmonics from Bulk Semiconductors

Kaneshima, Keisuke, Shinohara, Yasushi, Takeuchi, Kengo, Ishii, Nobuhisa, Imasaka, Kotaro, Kaji, Tomohiro, Ashihara, Satoshi, Ishikawa, Kenichi L., Itatani, Jiro

PHYSICAL REVIEW LETTERS, 120(24), Jun, 2018 Peer-reviewed
Propagation length of mid-infrared surface plasmon polaritons on gold: Impact of morphology change by thermal annealing

Hiramatsu, Nobuyoshi, Kusa, Fumiya, Imasaka, Kotaro, Morichika, Ikki, Takegami, Akinobu, Ashihara, Satoshi

JOURNAL OF APPLIED PHYSICS, 120(17) 173103-173103, Nov, 2016 Peer-reviewed
Spontaneous polarization driven Mg concentration profile reconstruction in MgZnO/ZnO heterostructures

K. Imasaka, J. Falson, Y. Kozuka, A. Tsukazaki, M. Kawasaki

APPLIED PHYSICS LETTERS, 104(24) 242112-242112, Jun, 2014 Peer-reviewedLead author

Research History

Feb, 2023 - Present

特別研究員, 国立研究開発法人理化学研究所
Feb, 2020 - Jan, 2023

National Institutes for Quantum and Radiological Science and Technology
Sep, 2019 - Dec, 2019

The Graduate School of Engineering, The University of Tokyo
Feb, 2019 - Mar, 2019

リサーチアシスタント, 先端レーザーイノベーション拠点「次世代アト秒レーザー光源と先端計測技術の開発」部門, Q-LEAP Flagshipプロジェクト
Jul, 2018 - Dec, 2018

The Graduate School of Engineering, The University of Tokyo
Apr, 2015 - Mar, 2018

The Graduate School of Engineering, The University of Tokyo

Education

Apr, 2015 - Jan, 2020

物理工学専攻博士課程, 工学系研究科, 東京大学大学院
Apr, 2013 - Mar, 2015

物理工学専攻修士課程, 工学系研究科, 東京大学大学院
Apr, 2011 - Mar, 2013

Department of Applied Physics, The Faculty of Engineering, The University of Tokyo
Apr, 2009 - Mar, 2011

The University of Tokyo

Awards

May, 2024

優秀論文発表賞, ギガワット級アト秒パルスのサブミクロン集光の実現, 一般社団法人レーザー学会

Misc.

プラズモニックアンテナを用いた固体の高次高調波発生

芦原聡, 今坂光太郎

レーザー研究, 48(4), Apr, 2020 Last author
固体結晶GaSeにおける深紫外域の高次高調波発生(II)

梶智博, 今坂光太郎, 篠原康, 金島圭佑, 石井順久, 板谷治郎, 石川顕一, 芦原聡

応用物理学会春季学術講演会講演予稿集(CD-ROM), 65th, 2018
固体結晶GaSeにおける深紫外域の高次高調波発生

梶智博, 今坂光太郎, 金島圭佑, 石井順久, 板谷治郎, 芦原聡

応用物理学会秋季学術講演会講演予稿集(CD-ROM), 78th, 2017
DUV high-harmonic generation from a bulk crystal

梶智博, 今坂光太郎, 金島圭佑, 石井順久, 板谷治郎, 芦原聡

Optics & Photonics Japan講演予稿集(CD-ROM), 2017, 2017
7aAJ-4 Ultrafast laser-induced dynamics in CuB_2O_4 crystal

Imasaka K., Kalashnikova A. M., Pisarev R. V., Bezmaternykh L. N., Shimura T., Satoh T.

Meeting abstracts of the Physical Society of Japan, 69(2) 501-501, Aug 22, 2014

Major Presentations

Near-infrared femtosecond pulse generation by non-collinear optical parametric amplification in LiInS2

Kotaro Imasaka, Kanade Ogawa, Nobuhisa Ishii, Momoko Maruyama, Ryuji Itakura

OPTICS & PHOTONICS International Congress 2022, Apr 19, 2022, OPTICS & PHOTONICS International Council
High harmonic generation in solids driven by plasmonically enhanced near-fields

K. Imasaka, T. Kaji, T. Shimura, S. Ashihara

OSJ-OSA Joint Symposia in Optics & Photonic Japan 2018, Oct 30, 2018
Antenna-enhanced high harmonic generation in a wide-bandgap semiconductor ZnO

K. Imasaka, T. Kaji, T. Shimura, S. Ashihara

21st International Conference on Ultrafast Phenomena, Jul 18, 2018
Intraband and interband decomposition of high-orderharmonic spectra from bulk GaSe by an ab-initio simulation

Y. Shinohara, K. Kaneshima, K. Takeuchi, N. Ishii, K. Imasaka, T. Kaji, S. Ashihara, J. Itatani, K. L. Ishikawa

High-brightness Sources and Light-driven Interactions Congress 2018, Mar 28, 2018
Excitation of multiple coherent phonon modes in CuB2O4 via non-resonant impulsive stimulated Raman scattering

K. Imasaka, R. V. Pisarev, L. N. Bezmaternykh, T. Shimura, A. M. Kalashnikova, T. Satoh

Ultrafast Magnetism Conference 2017, Oct 9, 2017
Laser-Induced Antiferromagnetic-Paramagnetic Transition in a Complex Multi-Sublattice CuB2O4

A. M. Kalashnikova, K. Imasaka, R. V. Pisarev, L. N. Bezmaternykh, T. Shimura, T. Satoh

Magnetics and Optics Research International Symposium (MORIS) 2015, Nov 30, 2015

Research Projects

アト秒軟X線過渡吸収分光によるルチル・アナターゼ型酸化チタンの光触媒活性差の解明

科学研究費助成事業若手研究, 若手研究, 日本学術振興会, Apr, 2023 - Mar, 2025

今坂光太郎
ルチル型・アナターゼ型TiO2における光触媒活性のアト秒電子ダイナミクス解明

令和4年度戦略的理事長ファンド, 萌芽的研究, 国立研究開発法人量子科学技術研究開発機構, Apr, 2022 - Jan, 2023

今坂光太郎
Antenna-enhanced high harmonic generation in a wide-bandgap semiconductor ZnO

Committee Memberships

Jul, 2016 - Jul, 2016

IIS PhD Student Live 2016 運営委員

Profile Information

Research Areas

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Research History

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Misc.

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