Ishigure, Takaaki

写真a

Affiliation

Faculty of Science and Technology, Department of Applied Physics and Physico-Informatics (Yagami)

Position

Professor

Related Websites

External Links
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Career 【 Display / hide 】

  • 1996.04
    -
    1998.03

    財団法人神奈川科学技術アカデミー ,研究員

  • 1998.04
    -
    2001.03

    慶應義塾大学理工学部助手（有期）

  • 2001.04
    -
    2003.03

    慶應義塾大学理工学部 ,助手

  • 2003.04
    -
    2008.03

    慶應義塾大学理工学部,専任講師

  • 2005.01
    -
    2005.12

    コロンビア大学　電気工学科　訪問研究員

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Academic Background 【 Display / hide 】

  • 1991.03

    Keio University, Faculty of Science and Engineering, 応用化学科

    University, Graduated

  • 1993.03

    Keio University, Graduate School, Division of Science and Engineeri, 物質科学専攻

    Graduate School, Completed, Master's course

  • 1996.03

    Keio University, Graduate School, Division of Science and Engineeri, 物質科学専攻

    Graduate School, Completed, Doctoral course

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Academic Degrees 【 Display / hide 】

  • 工学, Keio University, 1996.03

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Research Themes 【 Display / hide 】

  • Polymer Optical Waveguide for Optical Interconnection, 

    　

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Books 【 Display / hide 】

  • 科学立国日本を築くPartⅡ 次代を拓く気鋭の研究者たち

    一般財団法人丸文財団選考委員会 （編集）　榊 裕之 (監修) （分担）　石榑 崇明, 日刊工業新聞社, 2017.03

    Scope: ポリマ光導波路の低分散化と光インターコネクションへの応用

  • 光インターコネクションの第二普及世代に向けた課題と予測 （光回路実装技術ロードマップ2016年度版）

    ISHIGURE TAKAAKI, エレクトロニクス実装学会光回路実装技術委員会, 2017.02

    Scope: 121-134

  • Optical Interconnects for Data Centers

    Takaaki Ishigure and Marika Immonen, Woodhead Publishing, 2016.11

    Scope: Chapter 7, Design and fabrication of multimode polymer waveguides for optical interconnects

  • 光インターコネクションの普及とさらなる進展 （光回路実装技術ロードマップ2013年度版）

    ISHIGURE TAKAAKI, エレクトロニクス実装学会光回路実装技術委員会, 2014.01

    Scope: 66-75

  • O Plus E

    ISHIGURE TAKAAKI, アドコム・メディア株式会社, 2011.03

    Scope: 370-375

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Papers 【 Display / hide 】

  • Temperature dependence of the coupling loss between polymer optical waveguides and SMF for co-packaging

    Kinoshita R., Ishigure T.

    Optics Express 33 ( 1 ) 1271 - 1286 2025.01

    　View Summary

    We theoretically calculate the coupling loss between single-mode fibers (SMFs) and polymer optical waveguides with different refractive index profiles. Temperature resistance is one of the concerns when integrating polymer optical waveguides near the electronics and photonics chips where they are highly likely to dissipate heat. Hence, the calculation focuses on the core size variations due to changes in operating temperature. The calculated results show that the refractive index variation with respect to temperature has a greater impact on coupling loss compared to the temperature-dependent core size variation. Then, polymer optical waveguides are experimentally fabricated and characterized. The temperature dependence of the output light intensity distribution from the fabricated waveguides is observed, as it is estimated by the theoretical calculation. In addition, it is also found that graded-index cores in polymer waveguides demonstrate slightly higher temperature stability in connection with SMF than their step-index counterparts. Such a low coupling loss with SMF could be maintained even in an environment at 100 °C, making polymer optical waveguides promising for the application of co-packaged optics.

  • Optimum core structural design of the polymer optical waveguides as edge couplers for co-packaging

    Kinoshita R., Ishigure T.

    Optics Express 32 ( 14 ) 24415 - 24431 2024.07

    　View Summary

    We simulate the optical properties of polymer optical waveguides with different refractive index profiles in their cores as coupling components (edge couplers) between single-mode fiber and SiOx waveguides. In this paper, we focus on the single-mode operation of graded-index (GI) core polymer waveguides, for which we previously demonstrated low propagation loss under multimode operation. We design the optimum core structure (size and index contrast) for different refractive index profiles, and then demonstrate the unique optical properties of GI waveguides contributing to the low optical loss compared to the step-index counterparts, in particular, mode field diameter variation and taper angle tolerance.

  • Polarization manipulation on step-index composite polymer beam splitters for photonics circuitry

    Afsary N., Tasnim F., Rasel M.O.F., Ishigure T.

    Heliyon 10 ( 3 )  2024.02

    ISSN  24058440

    　View Summary

    This paper presents composite beam splitters realized with polymer materials for developing photonic integrated circuits. We used organic-inorganic hybrid polymer materials to form this composite beam splitter realized with step-index (SI) core profiles. We used the alternating direction implicit technique of the Rsoft CAD BeamPROP solver to design and analyze these beam splitters. We successfully examined and manipulated the beam splitter's polarization dependency to obtain a 99% output efficiency with a 50:50 splitting ratio. The SI beam splitter exhibits an excess loss of 0.014 dB. When we apply polarized light in this beam splitter, the excess loss increases to 2 dB, and this loss gradually decreases as the angle of incident light increases. The excess loss reduces to 0.05 dB at the 31-degree angles of the incident polarized light. We also investigated the crosstalk of this beam splitter by varying the wavelength, and it is evident that the lowest crosstalk is −19.77 dB at the polarized angle of 31°.

  • 3D Polymer Optical Waveguide-based Fan-in/out Device for Silicon Photonics Chips

    Ito A., Ishigure T.

    British and Irish Conference on Optics and Photonics, BICOP 2024 in Proceedings British and Irish Conference on Optics and Photonics 2024  2024

    　View Summary

    To achieve a subminiature low-loss adiabatic coupler to silicon photonics chips, we design a PMT connector-integrated polymer waveguide device with circular single-mode cores to fabricate it using the Mosquito method.

  • 3D Polymer Optical Waveguide-based Fan-in/out Device for Silicon Photonics Chips

    Ito A., Ishigure T.

    13th IEEE CPMT Symposium Japan: Innovation of Packaging Technology for Advanced Heterogeneous Integration, ICSJ 2024    162 - 163 2024

    　View Summary

    To realize a subminiature low-loss adiabatic coupler to silicon photonics chips, we design a PMT connector- integrated polymer waveguide device with circular single- mode cores to fabricate it using the Mosquito method.

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

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Reviews, Commentaries, etc. 【 Display / hide 】

  • ポリマー光導波路の研究開発動向

    石榑 崇明

    エレクトロニクス実装学会誌 (一般社団法人　エレクトロニクス実装学会)  20 ( 5 ) 271 - 277 2017.09

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

  • なんでモスキート？？

    ISHIGURE TAKAAKI

    応用物理 (応用物理学会)  86 ( 7 ) 599 - 602 2017.07

    Article, review, commentary, editorial, etc. (other)

  • ポリマー光導波路

    石榑 崇明

    光技術コンタクト (日本オプトメカトロニクス協会)  55 ( 5 ) 10 - 17 2017.05

    Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media), Single Work,  ISSN  0913-7289

  • 3D high-density channel integration of a polymer optical waveguide using the Mosquito method

    Takaaki Ishigure, Daisuke Suganuma, Kazutomo Soma

    Chip Scale Review (Haley Publishing Inc)  19 ( 4 ) 32 - 35 2015.08

    Article, review, commentary, editorial, etc. (scientific journal),  ISSN  1526-1344

    　View Summary

    This article includes the review of a conference paper presented at ECTC 2014, which received the outstanding session paper award.

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Presentations 【 Display / hide 】

  • Accurate Core Alignment for Polymer Optical Waveguide in the Mosquito Method for High-Efficient Coupling

    Yoshie Morimoto,Kumi Date,and Takaaki Ishigure

    IEEE 68th Electronic Components and Technology Conference (San Diego, CA, USA) , 

    2018.06
    , 

    Poster presentation, IEEE Electronics Packaging (EP) Society

  • Direct Fabrication for Polymer Optical Waveguide in PMT Ferrule Using the Mosquito Method

    Takaaki Ishigure, Hikaru Masuda,Kumi Date,Chinami Marushima. Tadayuki Enomoto

    IEEE 68th Electronic Components and Technology Conference (San Diego, CA, USA) , 

    2018.05
    , 

    Oral presentation (general), IEEE Electronics Packaging (EP) Society

  • Multimode / Single-mode Polymer Waveguides for Optical Wiring from the Chip to On-Board

    Takaaki Ishigure

    2018 International Conference on Electronics Packaging and iMAPS All Asia Conference (ICEP-IAAC2018) (Mie, Japan) , 

    2018.04
    , 

    Oral presentation (invited, special)

  • 広帯域・高密度オンボード光配線のためのポリマー光導波路

    石榑 崇明

    電子情報通信学会2018総合大会 (東京) , 

    2018.03
    , 

    Oral presentation (invited, special)

    　View Summary

    我々は，データセンタネットワーク配線の主流であったマルチモードファイバ（MMF）との高い接続性に重きを置いてポリマー光導波路の研究開発をを進めてきた．その中から考案したモスキート法は，マルチモードのみならずシングルモード導波路，さらには，従来のリソグラフィを応用した手法では作製が困難な導波路素子を容易に作製できることが分かってきた．本稿では，これまでに我々が報告してきたポリマー光導波路のオンボード光配線への適合性について紹介する．

  • 屈折率分布型ポリマー光導波路のマルチモードファイバ−光源間結合素子への応用

    幡井亮介，香取健司，石榑崇明

    第32回エレクトロニクス実装学会講演大会 (野田市，千葉) , 

    2018.03
    , 

    Oral presentation (general), 一般社団法人　エレクトロニクス実装学会

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

  • Research on high-density 3-dimensional polymer optical waveguide device for photonics-electronics convergence

    2023.04
    -
    2027.03

    基盤研究(B), Principal investigator

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Awards 【 Display / hide 】

  • 2017年度 エレクトロニクスソサイエティ活動功労表彰

    石榑崇明, 2018.03, 一般社団法人　電子情報通信学会　エレクトロニクスソサイエティ, 光エレクトロニクス研究専門委員会幹事としての貢献

  • エレクトロニクス実装学会春季講演大会　講演大会優秀賞

    増田輝，中條徳男，石榑崇明, 2018.03, 一般社団法人　エレクトロニクス実装学会, 多段光デバイスとの接続に向けたオンボード3次元Fan-in/out導波路の作製

  • The 64th Electronic Components and Technology Conference, Outstanding Oral Session Paper Award

    Takaaki Ishigure, Daisuke Suganuma, and Kazutomo Soma, 2015.05, IEEE CPMT, Three-Dimensional High Density Channel Integration of Polymer Optical Waveguide Using the Mosquito Method

    Country： United States

    　View Description

    第64回ECTC2014にて口頭発表した論文「Three-Dimensional High Density Channel Integration of Polymer Optical Waveguide Using the Mosquito Method」に対して授与された．

  • The 61st Electronic Components Technology Conference (ECTC 2011) Outstanding Poster Paper Award

    Takaaki Ishigure, Ryota Ishiguro, Hisashi Uno, Hsiang-Han Hsu, 2012.05, IEEE CPMT Society, Maximum channel density in multimode optical waveguides for parallel interconnection

  • 丸文研究奨励賞

    ISHIGURE TAKAAKI, 2008.03, ポリマー光ファイバ・導波路の低損失・低分散化と超高速光インターコネクションへの応用に関する研究

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Courses Taught 【 Display / hide 】

  • PRESENTATION TECHNIQUE

    2025

  • PHOTONICS

    2025

  • NANO SCALE SCIENCE JOINT SEMINAR

    2025

  • MATERIAL DESIGN SCIENCE JOINT SEMINAR

    2025

  • LABORATORY IN SCIENCE

    2025

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Social Activities 【 Display / hide 】

  • Japan Science and Technology Corpoation ERATO

    2000.10
    -
    2004.09

  • 通産省　「情報家電機器間の相互接続正確保のための標準化」委員会

    1999.04
    -
    2001.03
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Memberships in Academic Societies 【 Display / hide 】

  • 応用物理学会分科会　フォトニクス分科会, 

    2015.01
    -
    Present

  • 応用物理学会分科会　日本光学会, 

    2012.04
    -
    2014.12

  • The 18th OptoElectronics and Communications Conference (OECC2013) / Photonics in Switching 2013 (PS2013), 

    2012.02
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    2013.07

  • 電子情報通信学会　光エレクトロニクス（OPE）研究専門委員会, 

    2011.05
    -
    Present

  • Japan Institute of Electronics Packaging, 

    2011.05
    -
    2013.04

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Committee Experiences 【 Display / hide 】

  • 2025.01
    -
    Present

    IEEE CPMT JAPAN Chapter Chair, IEEE CPMT

  • 2024.06
    -
    Present

    Photonics Subcommittee Chair, IEEE Electronics Components Technology Conference (ECTC)

  • 2023.06
    -
    2024.05

    Photonics Subcommittee Assistant Chair, IEEE Electronics Components Technology Conference (ECTC)

  • 2023.01
    -
    2025.12

    IEEE CPMT JAPAN Chapter　Vice Chair, IEEE CPMT

  • 2022.06
    -
    2024.05

    常任理事, エレクトロニクス実装学会

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