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• R. Shibata, S. Fujii, and S. Watanabe
  "Integer-locking condition for stable dual-comb interferometry in situations with fluctuating frequency-comb repetition rates."
  Optica Open. Preprint.(Opt. Express, Accepted.)
• 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."
  arXiv:2312.07029. (Phys. Rev. Appl., Accepted.)

• D. Nishikawa, K. Maezawa, S. Fujii, M. Okano, and 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).

• M. Okano, and S. Watanabe
  "Triggerless data acquisition in asynchronous optical-sampling terahertz time-domain spectroscopy based on dual-comb system."
  Opt. Express 30 (22), pp. 39613-39623 (2022).
• A. Iwasaki, D. Nishikawa, M. Okano, S. Tateno, K. Yamanoi, Y. Nozaki, and S. Watanabe
  "Temporal-offset dual-comb vibrometer with picometer axial precision."
  APL Photonics 7 (10), 106101 (2022). Scilightによる紹介記事 プレスリリース
• M. Nakagawa, M. Okano, and S. Watanabe
  "Polarization-sensitive terahertz time-domain spectroscopy system without mechanical moving parts."
  Opt. Express 30 (16), pp. 29421-29434 (2022).
• K. Mizuta, M. Okano, T. Morimoto, S. Ata, and S. Watanabe
  "Strain-induced irreversible change of the conductive network in a rubber/carbon-black composite revealed by polarization-resolved terahertz dielectric spectroscopy."
  Appl. Phys. Lett. 121 (2), 024101 (2022).
• K. A. Sumihara, S. Okubo, M. Okano, H. Inaba, S. Watanabe
  "Ultra-precise determination of thicknesses and refractive indices of optically thick dispersive materials by dual-comb spectroscopy."
  Opt. Express 30 (2), pp. 2734-2747 (2022). プレスリリース

• T. Fukuda, M. Okano, and S. Watanabe
  "Interferogram-based determination of the absolute mode numbers of optical frequency combs in dual-comb spectroscopy."
  Opt. Express 29 (14), pp. 22214-22227 (2021).

• M. Okano*, T. Takahashi*, and S. Watanabe (* Equal contribution)
  "Ultrafast coherent control of higher-order spin waves in a nife thin film by double-pulse excitation."
  Appl. Phys. Lett. 117 (8), 082407 (2020).
• J. H., N. Kurokawa, M. Okano, A. Hotta, and S. Watanabe
  "Evaluation of crystallinity and hydrogen bond formation in stereocomplex poly(lactic acid) films by terahertz time-domain spectroscopy."
  Macromolecules 53 (16), pp. 7171-7177 (2020).
• K. Xu, E. Bayati, K. Oguchi, S. Watanabe, D. P. Winebrenner, and M. H. Arbab
  "Terahertz time-domain polarimetry (THz-TDP) based on the spinning E-O sampling technique: determination of precision and calibration."
  Opt. Express 28 (9), pp. 13482-13496 (2020).

• K. A. Sumihara, S. Okubo, K. Oguchi, M. Okano, H. Inaba, and S. Watanabe
  " Polarization-sensitive dual-comb spectroscopy with an electro-optic modulator for determination of anisotropic optical responses of materials."
  Opt. Express 27 (24), pp. 35141-35165 (2019).
• M. Nakamura, M. Okano, and S. Watanabe
  "Real-Time Monitoring of Structural Changes in Poly(lactic acid) during Thermal Treatment by High-Speed Terahertz Time-Domain Spectroscopy For Nondestructive Inspection."
  ACS Appl. Polym. Mater. 1 (11), pp. 3008-3016 (2019).
• K. Suzuki, K. Oguchi, Y. Monnai, M. Okano, and S. Watanabe
  "Spatio-temporal imaging of terahertz electric-field vector: Observation of polarization-dependent knife-edge diffraction."
  Appl. Phys. Express 12 (5), 052010 (2019).
• [Invited Review] K. Oguchi, M. Okano, and S. Watanabe
  "Polarization-sensitive electro-optic sampling of elliptically-polarized terahertz pulses: Theoretical description and experimental demonstration."
  Particles 2 (1), 70 (2019).
• [Invited Review] M. Okano, and S. Watanabe
  "Internal Status of Visibly Opaque Black Rubbers Investigated by Terahertz Polarization Spectroscopy: Fundamentals and Applications."
  Polymers 11 (1), 9 (2019).
• S. Watanabe, M. Fujii, and M. Okano
  "Impact of carbon black aggregates on the optical properties of black rubber samples in the terahertz frequency range."
  Advanced Materials Letters 10 (1), 48 (2019).

• [Invited Review] S. Watanabe
  "Terahertz Polarization Imaging and Its Applications."
  Photonics 5 (4), 58 (2018).
• M. Okano, and S. Watanabe
  "Inspection of internal filler alignment in visibly opaque carbon-black?rubber composites by terahertz polarization spectroscopy in reflection mode."
  Polym. Test. 72, 196-201 (2018).
• H. Shibata, M. Okano, and S. Watanabe
  "Ultrafast control of coherent spin precession in ferromagnetic thin films via thermal spin excitation processes induced by two-pulse laser excitation."
  Phys. Rev. B 97 (1), 014438 (2018). プレスリリース

• M. Okano, M. Fujii, and S. Watanabe
  "Anisotropic percolation conduction in elastomer-carbon black composites investigated by polarization-sensitive terahertz time-domain spectroscopy."
  Appl. Phys. Lett. 111 (22), 221902 (2017).
• A. Moriwaki*, M. Okano*, and S. Watanabe (* Equal contribution)
  "Internal triaxial strain imaging of visibly opaque black rubbers with terahertz polarization spectroscopy."
  APL Photonics 2 (10), 106101 (2017). プレスリリース
• K. Oguchi, M. Okano, and S. Watanabe
  "Retrieving the undistorted terahertz time-domain electric-field vector from the electro-optic effect."
  J. Opt. Soc. Am. B 34 (9), 1946-1956 (2017). Selected as an Editor's pick. (The article with excellent scientific quality and are representative of the work taking place in a specific field.)
• H. Iwasaki, M. Nakamura, N. Komatsubara, M. Okano, M. Nakasako, H. Sato, and S. Watanabe
  "Controlled terahertz birefringence in stretched poly(lactic acid) films investigated by terahertz time-domain spectroscopy and wide-angle X-ray scattering."
  J. Phys. Chem. B 121 (28), 6951-6957 (2017).
• K. Shibata, M. Uemoto, M. Takai, and S. Watanabe
  "Detailed study of transient anomalous electric field vector focused by parabolic mirror."
  J. Opt. 19 (3), 035603 (2017).
• S. Nakayama, M. Okano, Y. Nozaki, and S. Watanabe
  "Magneto-optic Kerr effect CCD imaging with polarization modulation technique."
  AIP Advances 7 (5), 056802 (2017).
• K. A. Sumihara, S. Okubo, M. Okano, H. Inaba, and S. Watanabe
  "Polarization-sensitive dual-comb spectroscopy."
  J. Opt. Soc. Am. B 34 (1), 154-159 (2017).

• M. Okano and S. Watanabe
  "Anisotropic optical response of optically opaque elastomers with conductive fillers as revealed by terahertz polarization spectroscopy."
  Sci. Rep. 6, 39079 (2016). プレスリリース 新聞記事（該当記事にリンクします[転載許可済]） 2017年1月11日：日経産業新聞「タイヤ内の異常検査　慶大　特殊な光使う小型装置」 テレビ番組出演（撮影風景にリンクします） 2017年2月19日：TBSテレビ「未来の起源」
• M. Takai, K. Shibata, M. Uemoto, and S. Watanabe
  "Spatial polarization variation in terahertz electromagnetic wave focused by off-axis parabolic mirror."
  Appl. Phys. Express 9 (5), 052206 (2016).
• K. Oguchi, H. Iwasaki, M. Okano, and S. Watanabe
  "Polarization-sensitive electro-optic detection of terahertz wave using three different types of crystal symmetry: Toward broadband polarization spectroscopy."
  Appl. Phys. Lett. 108 (1), 011105 (2016).

• K. Shibata, M. Takai, M. Uemoto, and S. Watanabe
  "Intrinsic formation of electromagnetic divergence and rotation by parabolic focusing."
  Phys. Rev. A 92 (5), 053806 (8 pages) (2015).

• K. Oguchi, N. Yasumatsu, and S. Watanabe
  "Polarization detection of terahertz radiation via the electro-optic effect using zinc-blende crystal symmetry."
  J. Opt. Soc. Am. B 31 (12), 3170-3180 (2014).
• M. Takai, M. Takeda, M. Sasaki, T. Tachizaki, N. Yasumatsu, and S. Watanabe
  "Video-rate terahertz electric-field vector imaging."
  Appl. Phys. Lett. 105 (15), 151103 (2014). Keio Research highlightsに取り上げられました(2015/3/6)。 A quick spin unleashes waves of the future
• N. Yasumatsu, A. Kasatani, K. Oguchi, and S. Watanabe
  "High-speed terahertz time-domain polarimeter based on an electro-optic modulation technique."
  Appl. Phys. Express 7 (9), 092401 (2014). プレスリリース 新聞記事（該当記事にリンクはしていません。） 2014年9月11日：日経産業新聞

• N. Yasumatsu, and S. Watanabe
  "Robustness of electric field vector sensing of electromagnetic waves by analyzing crystal angle dependence of the electro-optic effect."
  J. Opt. Soc. Am. B 30 (11), 2940-2951 (2013).
  
• S. Watanabe, N. Yasumatsu, K. Oguchi, M. Takeda, T. Suzuki, and T. Tachizaki
  "Real-time terahertz time-domain polarization analyzer with 80-MHz repetition-rate femtosecond laser pulses."
  Sensors 13 (3), 3299-3312 (2013).

• R. Shimano, S. Watanabe, and R. Matsunaga
  "Intense terahertz pulse-induced nonlinear responses in carbon nanotubes."
  Journal of Infrared, Millimeter, and Terahertz Waves 33 (8), 861-869 (2012).
• N. Yasumatsu, and S. Watanabe
  "T-ray topography by time-domain polarimetry."
  Opt. Lett. 37 (13), 2706-2708 (2012). (Also included in: Virtual Journal for Biomedical Optics -- Aug. 28, 2012. ) プレスリリース 新聞記事（すべて転載許可済） 2012年7月4日：日刊工業新聞(朝刊17面) 2012年7月5日：日経産業新聞(朝刊11面) 2012年7月6日：化学工業日報(朝刊8面)
• N. Yasumatsu, and S. Watanabe
  "Precise real-time polarization measurement of terahertz electromagnetic waves by a spinning electro-optic sensor."
  Rev. Sci. Instrum. 83 (2), 023104 (2012).
  (Also included in: Virtual Journal of Ultrafast Science -- March 2012 )

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