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Research

Current Research Theme：
　Time domain observation and control of ultrafast spin excitation with magnetic fields of terahertz pulse


Papers
  1. "The synthesis of rhodium substituted ε-iron oxide exhibiting super high frequency natural resonance "
    A. Namai, M. Yoshikiyo, S. Umeda, T. Yoshida, T. Miyazaki, M. Nakajima, K. Yamaguchi, T. Suemoto, S. Ohkoshi
    J. Mater. Chem. C 1, 5200 (2013).

  2. "Longitudinal terahertz wave generation from an air plasma filament induced by a femtosecond laser"
    Y. Minami, T. Kurihara, K. Yamaguchi, M. Nakajima, T. Suemoto
    Applied Physics Letters 102, 151106 (2013).

  3. "Terahertz Time-Domain Observation of Spin Reorientation in Orthoferrite ErFeO3 through Magnetic Free Induction Decay"
    K. Yamaguchi, T. Kurihara, Y. Minami, M. Nakajima, T. Suemoto
    Physical Review Letters 110 137204 (2013).

  4. "High-power THz wave generation in plasma induced by polarization adjusted two-color laser pulses"
    Y. Minami, T. Kurihara, K. Yamaguchi, M. Nakajima, T. Suemoto
    Applied Physics Letters 102, 041105 (2013).
    Erratum: Appl. Phys. Lett. 102, 069902 (2013).

  5. in Japanese "Coherent control of spin precession motion by impulsive excitation of Terahertz magnetic field"
    M. Nakajima, K. Yamaguchi, T. Suemoto
    OYO BUTSURI (JSAP ) 81, 317 (2012).
  6. "Ultrafast Coherent Control of Spin Precession Motion by Terahertz Magnetic Pulses"
    M. Nakajima, K. Yamaguchi, T. Suemoto
    Acta Physica Polonica A 121, 343 (2012).
  7. "Coherent control of spin precession motion with impulsive magnetic fields of half-cycle terahertz radiation"
    K. Yamaguchi, M. Nakajima, T. Suemoto
    Phys. Rev. Lett. 105, 237201 (2010).
  8. "Light-Driven Actuator with Shape Memory Alloy for Manipulation of Macroscopic Objects"
    Hideki Okamura, Keita Yamaguchi, and Ryosuke Ono
    International Journal of Optomechatronics 3(4) 277-288 (2009)
  9. "Light-Driven Actuator with Energy Conversion Efficiency in the Order of 1%"
    Keita Yamaguchi, Ryosuke Ono, and Hideki Okamura
    Applied Physics Express, 2, 34502 (2009).
  10. "Light-driven actuator using NiTi shape memory alloy"
    Keita Yamaguchi, Ryosuke Ono, and Hideki Okamura
    Proc. SPIE 7266, 72660B (2008)

Awards
  1. Student Best Presentation Award (International Symposium on Frontiers in Terahertz Technology 2012)

  2. 37th International Conference on Infrared and Milimeter and Terahertz Waves (IRMMW-THz 2012) Student Award (First Place)

  3. Terahertz Summer School 2012 (JSAP) Student Presentation Award

  4. 31st（Fall, 2011）JSAP Young Scientist Oral Presentation Award

  5. Terahertz Summer School 2011 (JSAP) Student Presentation Award

Conference
  1. K. Yamaguchi, T. Kurihara, M. Nakajima, T. Suemoto, Physical Society of Japan, Hiroshima University, 2013.3.
  2. Keita Yamaguchi, T. Kurihara, Y. Minami, M. Nakajima, and T. Suemoto,
    Pos.2 31"Study of Spin Reorientation Phenomena in Erbium Orthoferrite Observed by Free Induction Decay Signals After Half Cycle THz Pulse Excitation,"
    International Symposium on Frontiers in Terahertz Technology 2012, Nara, Japan, Nov 2012.

  3. Keita Yamaguchi, T. Kurihara, Y. Minami, M. Nakajima, and T. Suemoto,
    Thu-B-4-3"Observation of Spontatneous Spin Reorientation in ErFeO3 with Terahertz Time Domain Spectroscopy,"
    37th International Conference on Infrared and Milimeter and Terahertz Waves, Wollongong, Australia, Sep 2012.
  4. K. Yamaguchi, T. Kurihara, Y. Minami, M. Nakajima, T. Suemoto, Physical Society of Japan, Kanseigakuin University, 2012.3.
  5. T. Kurihara,K. Yamaguchi, Y. Minami, M. Nakajima, T. Suemoto, Physical Society of Japan, Kanseigakuin University, 2012.3.
  6. Y. Minami, T. Kurihara,K. Yamaguchi, M. Nakajima, T. Suemoto, Physical Society of Japan, Kanseigakuin University, 2012.3.
  7. K. Yamaguchi, M. Nakajima, Y. Minami, T. Suemoto, The Japan Society of Applied Physics, Waseda University, 2012.3.
  8. Y. Minami, T, Kurihara, K. Yamaguchi, M. Nakajima, T. Suemoto,The Japan Society of Applied Physics, Waseda University, , 2012.3.
  9. K. Yamaguchi, M. Nakajima, Y. Minami, T. Suemoto, Physical Society of Japan, Toyama, 2011.9.
  10. K. Yamaguchi, M. Nakajima, Y. Minami, T. Suemoto, 1p-F-8, The Japan Society of Applied Physics, Yamagata, 2011.8-9.
  11. Y. Minami, M. Nakajima, K. Yamaguchi, T. Suemoto, 1a-F-4, The Japan Society of Applied Physics, Yamagata, 2011.8-9.
  12. M. Nakajima, Keita Yamaguchi, and T. Suemoto, "Ultrafast Coherent Control of Spin Precession Motion by Terahertz Magnetic Pulses"
    4th International Conference on Photoinduced Phase Transitions and Cooperative Phenomena, Wroclaw, Poland, Jun-July 2011.
  13. K. Yamaguchi, M. Nakajima, T. Suemoto, Physical Society of Japan, Niigata, 2011.3.
  14. K. Yamaguchi, M. Nakajima, T. Suemoto, 23aRE-11, Physical Society of Japan, Osaka, 2010.9.
  15. Keita Yamaguchi, M. Nakajima, and T. Suemoto
    Mo-A2.5"Coherent Control of Spin Precessional Motion in Yttrium Orthoferrite with Impulsive Terahertz Pulse Excitations"
    35th International Conference on Infrared and Milimeter and Terahertz Waves, Rome, Italy, Sep 2010.
  16. M. Nakajima, K. Yamaguchi, T. Suemoto, 27aPS-96, Physical Society of Japan, Kumamoto, 2009.9.
  17. "Light-driven actuator using NiTi shape memory alloy"
    International Symposium on Optomechatronic Technologies, San Diego, CA, USA, Nov 2008.