Terahertz time domain spectroscopy of complex dielectric constants of boson peaks

  • Kojima S
  • Wada Takeda M
  • Nishizawa S
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Using THz time domain spectroscopy we have observed both the real and the imaginary parts of complex dielectric constants in the far-infrared region for a glassy polymethyl methacrylate (PMMA). The intensity and phase of transmittance of PMMA were accurately measured in the frequency range between 5 and 110 cm-1. The strong absorption appeared around a boson peak (BP) frequency, which was also observed by Raman scattering. The broad peak of an imaginary part related to BP shows a similar line-shape to the reduced depolarized Raman spectrum. © 2003 Elsevier Science B.V. All rights reserved.

Author-supplied keywords

  • Boson peak
  • Dielectric constants
  • Polymethyl methacrylate
  • Raman scattering
  • THz time domain spectroscopy

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  • S. Kojima

  • M. Wada Takeda

  • S. Nishizawa

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