L. Yang, R. Takabayashi, Y. Mototani, T. Murakami, H. Kumazaki, Y. Zhuang, X. Wei, T. Tanabe, and S. Fujii, "High-power picosecond pulsed Kerr soliton microcombs," (under consideration)
K. Tanikawa, M. Imamura, A. Yomoda, S. Kogure, R. Sugano, S. Kawanishi, S. Fujii, and T. Tanabe, "Soliton-comb-based photonic microwave filter operating in the 300 GHz band," Photon. Res. 13, 1282-1289 (2025).
K. Tanikawa, S. Fujii, S. Kogure, S. Tanaka, S. Tasaka, K. Wada, S. Kawanishi, and T. Tanabe, "Field Trial of Low-Latency, Short-Reach Optical Communication Employing a Microresonator Frequency Comb Light Source," IEEE Trans. Electron. E108–C, 146-152 (2025).
R. Imamura, S. Fujii, K. Nagashima, and T. Tanabe, "Scalable fabrication of erbium-doped high-Q silica microtoroid resonators via sol-gel coating," Opt. Contin. 4, 512-521 (2025).
T. Murakami, K. Wada, S. Kogure, R. Takabayashi, L. Yang, R. Shibata, H. Kumazaki, S. Watanabe, A. Ishizawa, T. Tanabe, and S. Fujii, "Architecture for coherent dual-comb spectroscopy and low-noise photonic microwave generation using mechanically actuated soliton microcombs," Opt. Lett. 50, 1417-1420 (2025).
S. Kogure, R. Sugano, S. Fujii and T. Tanabe, "Transition between low- and high-noise modulation instability microcombs in a silicon nitride microresonator," Jpn. J. Appl. Phys. 64, 012003 (2025).
D. Yamashita, N. Fang, S. Fujii, Y. K. Kato, "Hybrid silicon all-optical switching devices integrated with two-dimensional material," Adv. Opt. Mater. 13, 2402531 (2025).
Y. Nozaki, H. Sukegawa, S. Watanabe, S. Yunoki, T. Horaguchi, H. Nakayama, K. Yamanoi, Z. Wen, C. He, J. Song, T. Ohkubo, S. Mitani, K. Maezawa, D. Nishikawa, S. Fujii, M. Matsuo, J. Fujimoto, S. Maekawa., "Gyro-spintronic material science using vorticity gradient in solids," Sci. Technol. Adv. Mater. 26, 2428153 (2025).
D. Kozawa, S. Fujii, and Y. K. Kato, "Intrinsic process for upconversion photoluminescence via K-momentum phonon coupling in carbon nanotubes," Phys. Rev. B 110, 15, 155418 (2024).
R. Imamura, S. Fujii, A. Nakashima, and T. Tanabe, "Exceptional point proximity-driven mode-locking in coupled microresonators," Opt. Express 32, 22280-22290 (2024).
C. F. Fong, D. Yamashita, N. Fang, S. Fujii, Y. -R. Chang, T. Taniguchi, K. Watanabe, and Y. K. Kato, "Self-aligned hybrid nanocavities using atomically thin materials, " ACS Photonics 11, 6, 2247-2254 (2024).
K. Maezawa, S. Fujii, K. Yamanoi, Y. Nozaki, and S. Watanabe, "Spatiotemporal visualization of a surface acoustic wave coupled to magnons across a submillimeter-long sample by pulsed laser interferometry" Phys. Rev. Applied, 21, 044047 (2024).
R. Shibata, S. Fujii, and S. Watanabe, "Integer-locking condition for stable dual-comb interferometry in situations with fluctuating frequency-comb repetition rates," Opt. Express 32, 17373-17387 (2024).
S. Fujii, K. Wada, S. Kogure, H. Kumazaki, and T. Tanabe, "Mechanically actuated Kerr soliton microcombs," Laser & Photonics Rev. 18, 2301329 (2024).
N. Fang, Y. R. Chang, S. Fujii, D. Yamashita, M. Maruyama, Y. Gao, C. F. Fong, D. Kozawa, K. Otsuka, K. Nagashio, S. Okada, and Y. K. Kato, "Room-temperature quantum emission from interface excitons in mixed-dimensional heterostructures," Nat. Commun. 15, 2871 (2024).
S. Fujii, N. Fang, D. Yamashita, D. Kozawa, C. F. Fong, Y. K. Kato, "van der Waals decoration of ultra-high-Q silica microcavities for χ(2)-χ(3) hybrid nonlinear photonics," Nano Lett. 24, 4209-4216 (2024).
S. Sota, K. Handa, S. Fujii, T. Tanabe, Y.Uzawa, K. Furusawa, and N. Sekine, "Fabrication of silicon nitride based high-Q microring resonators prepared by the hot-wire CVD method and their applications to frequency comb generation," Opt. Mater. Express 14, 1128-1138 (2024).
D. Moreno, S. Fujii, A. Nakashima, D. Lemcke, A. Uchida, P. Sanchis, and T. Tanabe, "Synchronization of two chaotic microresonator frequency combs," Opt. Express 32, 2460 (2024).
N. Fang, Y. R. Chang, D. Yamashita, S. Fujii, M. Maruyama, Y. Gao, C. F. Fong, K. Otsuka, K. Nagashio, S. Okada, Y. K. Kato, "Resonant exciton transfer in mixed-dimensional heterostructures for overcoming dimensional restrictions in optical processes," Nat. Commun. 14, 8152 (2023).
S. Sugawara, S. Fujii, S. Kawanishi, T. Tanabe, "Stability and mutual coherence of Raman combs in high-Q silica microresonators," Opt. Contin. 2, 1588-1596 (2023).
D. Nishikawa, K. Maezawa, S. Fujii, M. Okano, S. Watanabe, "A two-color dual-comb system for time-resolved measurements of ultrafast magnetization dynamics using triggerless asynchronous optical sampling," Rev. Sci. Instrum. 94, 063003 (2023).
S. Fujii, K. Wada, R. Sugano, H. Kumazaki, S. Kogure, Y. K. Kato, T. Tanabe, "Versatile tuning of Kerr soliton microcombs in crystalline microresonators," Commun. Phys. 6, 1 (2023).
B. Yu, S. Naka, H. Aoki, K. Kato, D. Yamashita, S. Fujii, Y. K. Kato, T. Fujigaya, and T. Shiraki, "ortho-Substituted Aryldiazonium Design for the Defect Configuration-Controlled Photoluminescent Functionalization of Chiral Single-Walled Carbon Nanotubes," ACS Nano 16, 12, 21452–21461 (2022).
N. Fang, D. Yamashita, S. Fujii, K. Otsuka, T. Taniguchi, K. Watanabe, K. Nagashio, Y. K. Kato, "Quantization of mode shifts in nanocavities integrated with atomically thin sheets," Adv. Opt. Mater. 10, 19, 2200538 (2022).
A. Nakashima, S. Fujii, R. Imamura, K. Nagashima, and T. Tanabe, "Deterministic generation of a perfect soliton crystal microcomb with a saturable absorber," Opt. Lett. 47, 6, 1458-1461 (2022).
Y. Hayama, S. Fujii, T. Tanabe, and Y. Kakinuma, "Theoretical approach on the critical depth of cut of single crystal MgF2 and application to a microcavity," Precision Engineering 73, 234-243 (2022).
S. Fujii, S. Tanaka, T. Ohtsuka, S. Kogure, K. Wada, H. Kumazaki, S. Tasaka, Y. Hashimoto, Y. Kobayashi, T. Araki, K. Furusawa, N. Sekine, S. Kawanishi, and T. Tanabe, “Dissipative Kerr soliton microcombs for FEC-free optical communications over 100 channels," Opt. Express 30, 2, 1351-1364 (2022).
T. S. L. P. Suzuki, A. Nakashima, K. Nagashima, R. Ishida, R. Imamura, S. Fujii, S. Y. Set, S. Yamashita, and T. Tanabe, "Design of a passively mode-locking whispering-gallery-mode microlaser," J. Opt. Soc. Am. B 38, 10, 3172-3178 (2021).
S. Fujii, Y. Hayama, K. Imamura, H. Kumazaki, Y. Kakinuma, and T. Tanabe, "All-precision-machining fabrication of ultrahigh-Q crystalline optical microresonators," Optica, 7, 6, 694-701 (2020). "Press release"
S. Fujii and T. Tanabe, "Dispersion engineering and measurement of whispering gallery mode microresonator for Kerr frequency comb generation," Nanophotonics 9, 5, 1087-1104 (2020).
S. Fujii, S. Tanaka, M. Fuchida, H. Amano, Y. Hayama, R. Suzuki, Y. Kakinuma, and T. Tanabe, "Octave-wide phase-matched four-wave mixing in dispersion engineered crystalline microresonators," Opt. Lett. 44, 12, 3146-3149 (2019). "Editor's pick"
Y. Zhuang, H. Kumazaki, S. Fujii, R. Imamura, N. A. B. Daud, R. Ishida, H. Chen, and T. Tanabe, "Coupling of a whispering gallery mode to a silicon chip with photonic crystal," Opt. Lett. 44, 23, 5731-5734 (2019).
T. Tanabe, S. Fujii, and R. Suzuki, "Review on microresonator frequency comb", Japanese Journal of Applied Physics 58, SJ0801 (2019).
R. Suzuki, S. Fujii, A. Hori, and T. Tanabe, "Theoretical study on dual-comb generation and soliton trapping in a single microresonator with orthogonally polarized dual-pumping", IEEE Photon. J. 11, 1, 1-11 (2019).
S. Fujii, Y. Okabe, R. Suzuki, T. Kato, A. Hori, Y. Honda, and T. Tanabe, "Analysis of mode coupling assisted Kerr comb generation in normal dispersion system," IEEE Photon. J., 10, 5, 1-11 (2018).
S. Fujii, T. Kato, R. Suzuki, A. Hori, and T. Tanabe, "Transition between Kerr comb and stimulated Raman comb in a silica whispering gallery mode microcavity," J. Opt. Soc. Am. B, 35, 1, 100-106 (2018). "Editor's pick"
Y. Honda, W. Yoshiki, T. Tetsumoto, S. Fujii, K. Furusawa, N. Sekine, and T. Tanabe, "Brillouin lasing in coupled silica toroid microcavities", Appl. Phys. Lett. 112 20, 201105 (2018).
R. Suzuki, A. Kubota, A. Hori, S. Fujii, and T. Tanabe, "Broadband gain induced Raman comb formation in a silica microresonator", J. Opt. Soc. Am. B 35, 4, 933-938 (2018).
S. Fujii, A. Hori, T. Kato, R. Suzuki, Y. Okabe, W. Yoshiki, A. C.-Jinnai, and T. Tanabe, "Effect on Kerr comb generation in a clockwise and counter-clockwise mode coupled microcavity," Opt. Express, 25, 22, 28969-28982 (2017).
S. Fujii, T. Kato, R. Suzuki, and T. Tanabe, "Third-harmonic blue light generation from Kerr clustered combs and dispersive waves," Opt. Lett., 42, 10, 2010-2013 (2017).
T. Kato, A. Hori, R. Suzuki, S. Fujii, T. Kobatake, and T. Tanabe, "Transverse mode interaction via stimulated Raman scattering comb in a silica microcavity," Opt. Express 25, 2, 857-866 (2017).
A. C.-Jinnai, T. Kato, S. Fujii, T. Nagano, T. Kobatake, and T. Tanabe, "Broad bandwidth third-harmonic generation via four-wave mixing and stimulated Raman scattering in a microcavity," Opt. Express 24, 23, 26322-263131 (2016).
今村 陸，鈴木 S. L. P. 智生，石田 蘭丸，藤井 瞬，セット ジ イヨン，山下 真司，田邉 孝純「小型モード同期レーザ開発に向けたエルビウム添加微小光共振器の作製と可飽和吸収特性」，電気学会論文誌C（電子・情報・システム部門誌），Vol. 142, No. 3, pp. 395-400 (2022).
木暮蒼真，藤井 瞬，田邉孝純，「超並列光通信のための集積光周波数コム光源」，レーザー研究，Vol. 50, No. 5, pp. 248-253 (2022).
藤井 瞬, "超精密機械加工技術が拓くマイクロ周波数コム応用", フォトニクスニュース, 7, 2, 60-64 (2021).
藤井 瞬，鈴木 良，堀 敦裕，久保田啓寛，田邉孝純, "微小共振器におけるカーコムの数値シミュレーション法", レーザー研究, 46, 2, 86-91 (2018).
田邉孝純，藤井 瞬，和田幸四郎，柿沼康弘，「微小光共振器を用いた光周波数コム」，電子情報通信学会誌，Vol. 103, No. 11, pp. 1105-1112 (2020).
田邉孝純，藤井 瞬，鈴木 良，柿沼康弘，「微小光共振器による光周波数コム」，光技術コンタクト，Vol. 57, No. 3, pp 16-23 (2019).
田邉孝純，鈴木良，藤井 瞬，久保田啓寛，堀敦裕，「微小光共振器によるマイクロコム発生」，レーザー研究，Vol. 46, No. 2, pp. 86-91 (2018).
Watanabe Group, Keio University | 渡邉研究室，慶應義塾大学理工学部物理学科
Kato Nanoscale Quantum Photonics Laboratory, RIKEN | 加藤ナノ量子フォトニクス研究室，理化学研究所
Tanabe Photonic Structure Group, Keio University | 田邉フォトニック構造研究室，慶應義塾大学理工学部電気情報工学科