KEIO RESEARCHERS INFORMATION SYSTEM

Career 【 Display / hide 】

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 】

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

Academic Degrees 【 Display / hide 】

Academic Degrees 【 Display / hide 】

• 工学, Keio University, 1996.03

Research Themes 【 Display / hide 】

Research Themes 【 Display / hide 】

• Polymer Optical Waveguide for Optical Interconnection, 

  　

Books 【 Display / hide 】

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 】

Papers 【 Display / hide 】

• Fabrication of graded-index core polymer optical waveguides enabling low loss with small bend radius (∼1 mm) using high ∆ resins

  Karakawa M., Ishigure T.

  Optics Express 34 ( 4 ) 6895 - 6907 2026.02

  　View Summary

  In this paper, circular graded-index (GI) core polymer optical waveguides are fabricated using the Mosquito method, applying a combination of resins with a high refractive index difference (∆) for their core and cladding materials. Optical properties of the fabricated waveguides are thoroughly evaluated. These waveguides are expected to exhibit strong optical confinement in their cores due to the synergistic effects of the high ∆ and GI refractive index profile. Notably, the experimentally fabricated multimode polymer optical waveguides achieve a bending loss of less than 0.1 dB, even under extreme conditions involving a 90° bend with a bend radius as small as 1 mm.

  • Access to Document (DOI)

• Biogenic design of silicious architectures on Moso bamboo culm

  Kazama M., Watanabe H., Hasekura C., Wakabayashi T., Ishigure T., Oaki Y., Imai H.

  Scientific Reports 15 ( 1 )  2025.12

  　View Summary

  Biosilicas that are produced in vascular plants (plant opal), such as Poaceae, have a variety of shapes and functions and are regarded as an excellent model for the architectural design of artificial amorphous materials. In this work, we studied the micro- and nanostructures and mechanical and optical functions of plant opals on the bamboo culm, which is available as an important natural material. The surface of the culm wall is totally covered with silicified epidermal cells containing silica wedges. The biogenic silicious architectures, such as silicified cell walls and wedges, are composed of nanoscale particles ~ 20–80 nm in diameter with cellulose nanofibrils. Silica wedges, which have a relatively low organic content and relatively high hardness and Young’s modulus, are initially formed on cellulose nanofibrils in an organic frame as a scaffold within a few weeks after the emergence of a bamboo shoot. Several months after the formation of the wedges, the epidermal cell walls, which protect the culm surface, are lightly silicified with cellulose nanofibrils. According to a numerical simulation, the silica wedges would have an optical function delivering sunlight to chloroplasts located under the epidermal cells.

  • Access to Document (DOI)

• PDMS-based tactile sensing: distributed sensor with a multiple-core polymer waveguide

  Yin Y., Ishigure T.

  Optics Express 33 ( 20 ) 42573 - 42585 2025.10

  　View Summary

  In this paper, we create a planar polymer optical waveguide sensor with four parallel cores. This four-core array features an optimized geometry obtained through a beam propagation method simulation. UV-curable polydimethyl siloxane is selected for the cladding, while a UV-curable acrylate resin is selected as the waveguide core. When pressure is applied to the core at different locations, precise sensing of the pressure value and location is achieved through changes in the output light intensity from the pressurized cores. The experimental results show that the sensitivities of four cores, Ch.1 to 4, in a fabricated waveguide sensor in a pressure range of 0-1.13 MPa, are 8.7 dB/MPa, 10.73 dB/MPa, 9.2 dB/MPa, and 10.88 dB/MPa, respectively. Additionally, we propose a 3D crossed core structure as a potential direction for future development. Optical waveguide structures not only demonstrate good flexibility and high sensitivity, but also have broad application potential, especially in the fields of flexible electronics and smart sensing.

  • Access to Document (DOI)

• 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.

  • Access to Document (DOI)

• Steeply Bent Core Single-Mode Polymer Waveguide with Low Bending Loss Fabricated Using the Mosquito Method

  Tanimoto A., Ishigure T.

  14th IEEE CPMT Symposium Japan Icsj 2025 Advanced Electronics Packaging Technology for Digital Twin    142 - 143 2025

  　View Summary

  Steeply bent core single-mode polymer optical waveguides are fabricated by varying the bending radius and core diameter using the Mosquito method. Then, we confirm that the small bending radius contributes to satisfy the singlemode condition even when the waveguide has high Δ. The bending loss under 1-mm bending radius can be reduced by designing slightly larger core size as 8.0 μ m.

  • Access to Document (DOI)

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

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

• 3 dimensional polymer optical waveguide for high density photonic integration

  Ishigure, Takaaki

  学事振興資金研究成果実績報告書 (慶應義塾大学)  2022

• Three-dimensional polymer optical waveguide for high density optical integration

  Ishigure, Takaaki

  学事振興資金研究成果実績報告書 (慶應義塾大学)  2021

• Fabrication of polymer parallel optical waveguide enabling high-speed and parallel optical interconnection

  ISHIGURE, TAKAAKI

  科学研究費補助金研究成果報告書 2008

Reviews, Commentaries, etc. 【 Display / hide 】

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)

  • Access to Document (DOI)

• 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.

Presentations 【 Display / hide 】

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

  [International presentation]  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

  [International presentation]  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

  [International presentation]  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

  [Domestic presentation]  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

  [Domestic presentation]  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 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

Awards 【 Display / hide 】

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 】

Courses Taught 【 Display / hide 】

• APPLIED PHYSICS AND PHYSICO-INFORMATIC PRACTICAL RESEARCH A

  2026

• GRADUATE RESEARCH ON MATHEMATICAL AND PHYSICAL SCIENCES 1

  2026

• PRESENTATION TECHNIQUE

  2026

• APPLIED PHYSICS AND PHYSICO-INFORMATICS LABORATORY D

  2026

• INDEPENDENT STUDY ON INTEGRATED DESIGN ENGINEERING

  2026

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Social Activities 【 Display / hide 】

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

Memberships in Academic Societies 【 Display / hide 】

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

  -

  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 】

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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