Terakawa, Mitsuhiro

写真a

Affiliation

Faculty of Science and Technology, Department of Electronics and Electrical Engineering (Yagami)

Position

Professor

Related Websites
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Career 【 Display / hide 】

  • 2005
    -
    2007

    Japan Society for the Promotion of Science, Doctoral Course Students (DC)

  • 2007
    -
    2008

    Massachusetts General Hospital, Wellman Center for Photomedicine, Research Fellow

  • 2007
    -
    2008

    Japan Society for the Promotion of Science, Postdoctoral Fellow

  • 2009
    -
    2010

    Keio University, Research Associate

  • 2010.04
    -
    2013.03

    Keio University, Department of Electronics and Electrical Engineering, Assistant Professor

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Academic Background 【 Display / hide 】

  • 2003.03

    Keio University, Science and Technology, Department of Electronics and Electrical Engineering

    University, Graduated

  • 2005.03

    Keio University, Science and Technology, Integrated Design Engineering

    Graduate School, Completed, Master's course

  • 2007.09

    Keio University, Science and Technology, Integrated Design Engineering

    Graduate School, Completed, Doctoral course

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Academic Degrees 【 Display / hide 】

  • 博士（工学）, 慶應義塾大学, 2007.09

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Matters concerning Career Achievements 【 Display / hide 】

  • 2013.04
    -
    2014.03

    電子工学科２年生担任

  • 2014.04
    -
    2015.03

    大学院総合デザイン工学専攻　専攻幹事

  • 2014.04
    -
    2015.03

    電子工学科３年生担任

  • 2015.04
    -
    2018.03

    大学院　研究科委員

  • 2016.04
    -
    2018.03

    大学院総合デザイン工学専攻　専攻幹事

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Research Areas 【 Display / hide 】

  • Nanotechnology/Materials / Optical engineering and photon science (laser processing, multi-photon manufacturing, softmaterials and biomaterials)

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Research Keywords 【 Display / hide 】

  • Laser processing

  • Soft materials

  • Biomaterials

  • Laser-induced carbonization and graphitization

  • Laser-based precise processing

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Books 【 Display / hide 】

  • Laser-Induced Carbonization and Graphitization. (in Handbook of Laser Micro- and Nano-Engineering)

    Mitsuhiro Terakawa, Springer Nature Switzerland AG, 2021.05

  • Laser-Induced Carbonization and Graphitization

    Terakawa M., Handbook of Laser Micro-and Nano-Engineering, 2021.01

    　View Summary

    This chapter presents the carbonization and graphitization of polymer materials through laser-based degradation to fabricate conductive structures. The fundamentals of degradation are first explained based on the thermal degradation and photodegradation of polymers to alter the chemical structures to form carbon-rich products. This process yields electrically conductive graphitic carbon under certain conditions. By using a laser as an energy source for the degradation, spatially targeted areas on bendable and stretchable elastomers can be altered to conductive structures that can be used in flexible electronics. Although laser-induced carbonization and graphitization can be traced back to the 1980s, research in this field was revived in the mid-2010s, and increased attention has been paid since then. Fundamental studies along with material analyses and applications of the formed conductive structures in various devices, such as supercapacitors, strain sensors, and bioelectronic devices, are also reviewed in this chapter. In addition, laser degradation of poly-dimethylsiloxane, which is a versatile polymer for flexible devices, and natural materials, such as cellulose, are highlighted as emerging precursors of laser-induced conductive structures.

  • Micro and Nano Fabrication Technology

    Mitsuhiro Terakawa, Springer, 2018

    Scope: Chapter "Femtosecond Laser Direct Writing"

  • Ultrafast Laser Processing: From Micro- to Nanoscale

    Mitsuhiro Terakawa, Minoru Obara, Pan Stanford Publishing, 2013

    Scope: Chapter 7 Nanoablation Using Nanosphere and Nanotip

  • Gold Nanoparticles: Properties, Characterization, and Fabrication

    Y. Tanaka, M. Terakawa, M. Obara, N. Nedyalkov, P. Atanasov, Nova Science Publishers, 2009

    Scope: Chapter 6 Plasmonic Nanopatterning of the Material Surface Mediated with Gold Nanoparticles Excited by a Femtosecond Laser Pulse

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Papers 【 Display / hide 】

  • Marine biodegradable polymer-derived graphitic carbon via laser direct writing for thermoelectric power generation

    Mari Kato, Yuma Hattori, Mitsuhiro Terakawa

    ACS Applied Electronic Materials 7 ( 12 ) 5505 - 5515 2025.06

    Research paper (scientific journal), Joint Work, Last author, Corresponding author, Accepted

    　View Summary

    Thermoelectric power generation is a renewable energy technology that converts thermal energy into electrical energy by using temperature gradients. The fabrication of thermoelectric generators requires thermoelectric materials with different Seebeck coefficients to be arranged according to the temperature gradient and desired device geometry. In this study, we demonstrated thermoelectric power generation using a conductive graphitic carbon structure fabricated via the laser-induced graphitization of a marine biodegradable polymer. For the first time, laser-induced graphitization of poly(3-hydroxybutyrate-co-3-hydroxyhexanoate), a marine biodegradable polymer, was achieved. Furthermore, we successfully fabricated spatially selective structures with different Seebeck coefficients, an essential requirement for thermoelectric generator construction by solely controlling the laser irradiation parameters. The fabricated structures generated thermoelectric power not only from temperature differences in the atmosphere but also from thermal gradients between water and air, demonstrating their potential applicability in both terrestrial and marine environments. The proposed method offers a sustainable approach to the fabrication of thermoelectric generators.

  • Laser direct writing of graphene quantum dots encircling conductive structures for stimuli-responsive anti-counterfeiting label

    Kosuke Tsukada, Mitsuhiro Terakawa

    Optics Express (Optica)  33 ( 9 ) 19479 - 19489 2025.04

    Joint Work, Last author, Corresponding author, Accepted

    　View Summary

    Graphene quantum dots (GQDs) are fluorescent materials whose fluorescence intensity changes in response to external stimuli. In this study, we demonstrated the fabrication of a semi-cylindrical conductive microstructure encircled by GQDs on polydimethylsiloxane in a single step by laser carbonization. By adjusting laser parameters, structures with different resistance values were selectively fabricated. Under the voltage application to the structure, Joule heating in low-resistance structures led to a decrease in GQDs fluorescence intensity, while high-resistance structures showed minimal changes. Combining these structures enabled voltage-responsive anti-counterfeiting labels, readable only under excitation light and voltage. The proposed method enables one-step fabrication of voltage-responsive structures by laser irradiation, thereby paving the way for the development of voltage-controlled anti-counterfeiting technology.

  • Direct Writing of Conductive Microstructures inside a Thermoresponsive Hydrogel

    Kashikawa K., Onoe H., Terakawa M.

    ACS Applied Polymer Materials 7 ( 8 ) 4771 - 4778 2025

    　View Summary

    The integration of soft electronic devices with biological systems has garnered increasing attention for applications such as bioinspired soft robotics and wearable health monitors. These devices are designed to interface with biological surfaces or tissues, mimicking the transmission of electrical signals through neural tissues while ensuring high biocompatibility and flexibility. Conductive polymer hydrogels, combining conductive polymers and hydrogels, have emerged as promising materials owing to their flexibility, stretchability, and biocompatibility. In the realization of advanced soft electronic devices, it is key to employ materials with high flexibility and biocompatibility and, moreover, develop techniques for the fabrication of precise and localized conductive structures inside hydrogels. In this study, we demonstrated the spatially selective polymerization of conductive polymers inside a thermoresponsive hydrogel. A poly(N-isopropylacrylamide) (PNIPAM) hydrogel was immersed in a precursor solution of polyaniline (PANI), and polymerization was induced by femtosecond laser pulse irradiation. Conductive polymer microstructures were successfully fabricated inside the hydrogel. Furthermore, using the thermal responsiveness of the PNIPAM hydrogel, we demonstrated that the electrical resistance of the PANI structures changed in response to temperature. The present method provides a strategy for the precise and localized fabrication of conductive structures inside hydrogels, offering an approach to the fabrication of soft electronic devices.

  • Laser-induced gold and silver nanoparticle implantation in glass for fabrication of plasmonic structures with multiple use

    N. Nedyalkov, Ru. Nikov, Ro. Nikov, A. Dikovska, N. Stankova, P. Atanasov, G. Atanasova, L. Aleksandrov, K. Grochowska, J. Karczewski, M. Terakawa

    Optics & Laser Technology  191   113361 2025

    Research paper (scientific journal), Joint Work, Accepted,  ISSN  00303992

    　View Summary

    In this work the method of laser induced reverse transfer is applied for a stabile implantation of gold and silver nanoparticles into glass substrate. The method is based on laser ablation of gold and silver targets covered by soda-lime glass. The experiments are performed using nanosecond laser pulses at wavelength of 1064 nm. The illumination of the target through the glass side results in ablation and embedding of the ablated material into the glass. At certain conditions the implantation process is highly efficient as multiple washing of the substrate with water and even a wiping do not remove the deposited material. Detailed analyses of the processed area are performed in order to clarify the morphology, composition and the structure of the material. The mechanisms of nanoparticle formation and their embedding is discussed on a basis of heat diffusion model describing the evolution of the temperature during laser interaction. Application of the formed structures in Surface Enhanced Raman Spectroscopy (SERS) is demonstrated, as a high-sensitive detection of Ammonium nitrate and organic dyes is obtained. Multiple use of the obtained materials in SERS is also evidenced.

  • High-resolution patterning of graphitic carbon structures in laser-induced graphitization of cellulose nanofiber film

    Yosuke Kondo, Ken Kashikawa, Mari Kato, Mitsuhiro Terakawa

    Optical Materials Express (Optica)  15 ( 1 ) 95 - 103 2024.12

    Research paper (scientific journal), Joint Work, Last author, Corresponding author, Accepted

    　View Summary

    In laser-induced graphitization, decreasing the linewidth of patterned structures is key to enhancing the potential in microdevice fabrication. In this study, we demonstrated that graphitic carbon structures with narrow linewidth can be directly patterned in laser-induced graphitization of cellulose nanofiber (CNF) film by immersing the film in CaI2 solution. The linewidth of the structures increased with increasing laser power, indicating that the linewidth can be readily controlled. Based on the above findings, we patterned multiple concentric structures with precisely controlled linewidth to fabricate a Fresnel zone plate, which can focus laser light in the visible wavelength range.

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Papers, etc., Registered in KOARA 【 Display / hide 】

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Reviews, Commentaries, etc. 【 Display / hide 】

  • Laser-based molecular delivery and its applications in plant science

    D. Heinemann, M. Zabic, M. Terakawa, J. Boch

    Plant Methods (Springer Nature)  18 ( 82 ) 1 - 14 2022.06

    Joint Work

  • レーザー炭化によるグラフェン生成とその新展開

    寺川光洋

    OPTORONICS 41 ( 484 ) 153 - 158 2022.04

    Article, review, commentary, editorial, etc. (other), Single Work, Lead author, Last author, Corresponding author

  • フェムト秒レーザー改質による高分子材料への導電性付与

    林秀一郎, 寺川光洋

    表面技術 71 ( 11 ) 684 - 688 2020.11

  • 超短パルスレーザーによる多光子還元

    寺川光洋

    光アライアンス 30 ( 8 ) 55 - 58 2019.08

    Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media), Single Work

  • Femtosecond Laser Processing of Biodegradable Polymers

    Mitsuhiro Terakawa

    Applied Sciences 8 ( 7 ) 1123 2018.07

    Article, review, commentary, editorial, etc. (scientific journal), Single Work

    　View Summary

    © 2018 by the authors. Biodegradable polymers have attracted increasing attention in tissue engineering and drug delivery systems owing to their high biocompatibility and biodegradability. Among the various methods for shape forming and modification of biodegradable polymers, laser processing has advantages in a dry processing approach that can process complex-shaped surfaces without using toxic chemical components. This review provides an overview of femtosecond laser processing of biodegradable polymers, especially in the last decade. The interaction mechanism of femtosecond laser pulse and biodegradable polymers, e.g., bond dissociation after laser irradiation, affects the degradable property of biodegradable polymers, which has the potential to control the degradation and sustainability of a structure. Applied studies on controlling cell behavior, tissue scaffolding, and drug release are also described.

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Presentations 【 Display / hide 】

  • Laser-induced graphitization of textile for water purification device

    Taishin Kasahara, Mitsuhiro Terakawa

    The 9th International Congress on Laser Advanced Materials Processing (LAMP2025), 

    2025.06
    , 

    Oral presentation (general)

  • One-step fabrication of graphitic carbon structure with an insulating coating by femtosecond laser pulse irradiation

    Naoto Yamaguchi, Yosuke Kondo, Mitsuhiro Terakawa

    The 9th International Congress on Laser Advanced Materials Processing (LAMP2025), 

    2025.06
    , 

    Poster presentation

  • Fabrication of metal-organic framework-5 microstructure by femtosecond laser irradiation

    Ryo Moriyama, Mari Kato, Mitsuhiro Terakawa

    The 9th International Congress on Laser Advanced Materials Processing (LAMP2025), 

    2025.06
    , 

    Oral presentation (general)

  • (Invited) Laser-patterned functional microstructures in hydrogels: fabrication and applications

    Mitsuhiro Terakawa

    SPIE Photonics West 2025, 

    2025.01
    , 

    Oral presentation (invited, special)

  • High-resolution patterning of graphitic carbon structures in laser carbonization of cellulose nanofiber film

    Y. Kondo, M. Terakawa

    SPIE Photonics West 2025, 

    2025.01
    , 

    Oral presentation (general)

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Research Projects of Competitive Funds, etc. 【 Display / hide 】

  • スマートマテリアルに駆動力と機能を付与するレーザープロセシング技術の確立

    2022.04
    -
    2026.03

    文部科学省・日本学術振興会, 科学研究費補助金 基盤研究(B), No Setting

  • レーザプロセシングにより実現するエネルギー・ハーベスティング・デバイス

    2022.04
    -
    2024.03

    東電記念財団, 研究助成（基礎研究）, No Setting

  • 高繰り返しフェムト秒レーザパルス照射による高結晶性かつ高導電性微細構造の直接描画

    2021.09
    -
    2024.03

    天田財団, 重点研究開発助成　課題研究, No Setting

  • 回折限界を超える極微細金属構造のレーザーファブリケーション

    2018.07
    -
    2021.03

    文部科学省・日本学術振興会, 科学研究費補助金　挑戦的研究（萌芽）, Research grant, Principal investigator

  • 三次元多光子レーザープロセシングによる機能因子放出スキャフォールドの実現

    2018.04
    -
    2022.03

    文部科学省・日本学術振興会, 科学研究費補助金　基盤研究(B), Research grant, Principal investigator

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Intellectual Property Rights, etc. 【 Display / hide 】

  • レーザーを用いた薬剤放出方法

    Date applied： 2013-046732  2013.03 

    Patent

  • 移植組織または臓器への薬剤導入方法ならびに薬剤導入装置

    Date applied： 特願2007-196580  2007.07 

    Date announced： 特開2008-49150   

    Patent

  • Method and apparatus for drug delivery to tissue or organ for transplant

    Date applied：   2007 

    Date announced： US 2009/0233987 A1  2009 

    Patent

  • 細胞への薬剤導入方法および細胞への薬剤導入装置

    Date applied： 特願2006-113384  2006.04 

    Date announced： 特開2007-284379   

    Patent

  • 薬剤導入方法及び薬剤導入装置

    Date applied： 特願2004-147971  2004.05 

    Date announced： 特開2005-330194   

    Patent

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Awards 【 Display / hide 】

  • Optica Fellow

    2025.01, Optica

    　View Description

    For achievements in laser processing and functionalization of soft materials for electrical and optical applications

  • SPIE Fellow

    2023.01, SPIE (International Society for Optics and Photonics)

    Type of Award： Other

  • 電子・情報・システム部門研究会 優秀論文発表賞

    2014.09, 電気学会

  • 応用物理学会　講演奨励賞

    TERAKAWA Mitsuhiro, 2012.03, 応用物理学会, フェムト秒レーザの多微粒子レンズ集光場による細胞膜の単一パルスプロセッシング

    Type of Award： Award from Japanese society, conference, symposium, etc.

  • 慶應義塾大学 総合デザイン工学専攻 優秀研究活動賞 (博士)

    TERAKAWA Mitsuhiro, 2008.03

    Type of Award： Keio commendation etc.

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Other 【 Display / hide 】

  • 2017年11月

    　View Details

    The Optical Society (OSA) News Release: Metal-Silicone Microstructures Could Enable New Types of Flexible Optical and Electrical Devices

  • 2014年03月

    　View Details

    SPIE Newsroom: Femtosecond laser pulses for smart drug delivery

  • 2012年04月

    　View Details

    SPIE Newsroom: Ultrafast near- and far-field nanoablation patterning

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Courses Taught 【 Display / hide 】

  • SEMINAR IN ELECTRONICS AND INFORMATION ENGINEERING(2)

    2025

  • SEMINAR IN ELECTRONICS AND INFORMATION ENGINEERING(1)

    2025

  • RECITATION IN ELECTRONICS AND INFORMATION ENGINEERING

    2025

  • PHYSICS D

    2025

  • PHYSICS C

    2025

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Memberships in Academic Societies 【 Display / hide 】

  • Optica Fellow, 

    2025.01
    -
    Present

  • Fellow of SPIE, 

    2023.01
    -
    Present

  • SPIE, Senior Member, 

    2019.06
    -
    Present

  • Optica (formerly OSA), Senior Member, 

    2019.06
    -
    Present

  • Japan Laser Processing Society, 

    2013.04
    -
    Present

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Committee Experiences 【 Display / hide 】

  • 2024.07
    -
    2026.05

    レーザー学会東京支部委員, 一般社団法人レーザー学会

  • 2024.04
    -
    Present

    副代表幹事, 光産業技術振興協会　多元技術融合光プロセス研究会

  • 2024.02
    -
    2025.02

    Program Committee, Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XXV, SPIE Photonics West 2025

  • 2024.02
    -
    2025.02

    Program Committee, Laser Applications in Microelectronic and Optoelectronic Manufacturing (LAMOM) XXX, SPIE Photonics West 2025

  • 2024.02
    -
    2025.02

    Program Committee, Laser-based Micro- and Nanoprocessing XIX, SPIE Photonics West 2025

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