Physical Origin of Magnetically Induced Periodic Structure Observed in Terahertz Radiation Spectrum Emitted from InAs

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  • Takahashi Hiroshi
    Department of Photo Science, The Graduate University for Advanced Studies, Shonan Village
  • Quema Alex
    Institute for Molecular Science (IMS)
  • Goto Masahiro
    Institute for Molecular Science (IMS)
  • Ono Shingo
    Institute for Molecular Science (IMS)
  • Sarukura Nobuhiko
    Institute for Molecular Science (IMS)
  • Nishijima Gen
    High Field Laboratory for Superconducting Materials, Institute for Materials Research, Tohoku University
  • Watanabe Kazuo
    High Field Laboratory for Superconducting Materials, Institute for Materials Research, Tohoku University

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Abstract

Terahertz (THz) radiation from femtosecond-laser-irradiated InAs (100) surface is investigated. It is found that THz-radiation spectrum exhibits two inter-related phenomena in a strong magnetic field under the Voigt configuration. The peak shift of THz-radiation spectrum toward lower frequency is observed with increasing magnetic field. Additionally, THz-radiation spectrum is found to posses a periodic structure owing to the interference of THz-radiation pulses from the front and back surfaces of the InAs substrate. The physical origin of the latter phenomenon is discussed by considering the magneto-plasma effect, which affects both real and imaginary parts of refractive index for THz-radiation propagating in a direction perpendicular to the magnetic field.

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