研究成果

[2021]

  • 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."
    arXiv:2108.13186, 22 pages, 6 figures. 現在投稿中です。
  • 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).

[2020]

  • 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).

[2019]

  • 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).

[2018]

[2017]

  • 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).

[2016]

[2015]

[2014]

[2013]

  • 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).

[2012]