Brillouin Scattering in CdIn2S4 Crystal--Determination of Elastic Constants and Photoelastic Constants

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  • Yamada Masayoshi
    Department of Electronic Engineering, Faculty of Engineering, Kobe University
  • Shirai Tatsutetsu
    Department of Electronic Engineering, Faculty of Engineering, Kobe University
  • Yamamoto Keiichi
    Department of Electronic Engineering, Faculty of Engineering, Kobe University
  • Abe Kenji
    Department of Electronic Engineering, Faculty of Engineering, Kobe University

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タイトル別名
  • Brillouin Scattering in CdIn<SUB>2</SUB>S<SUB>4</SUB> Crystal: Determination of Elastic Constants and Photoelastic Constants
  • Brillouin Scattering in CdIn2S4 Crystal

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The first observation of thermal Brillouin spectra in CdIn2S4 single crystals has been made at room temperature by using a sensitive photon-counting system, a piezoelectrically scanned Fabry-Perot interferometer and a He–Ne laser with the radiation wavelength of 632.8 nm. Brillouin doublets by acoustic phonons propagating along the [1, 0, 0], [1, 1, \sqrt2] and [\sqrt2+1, 1, 0] directions are observed at the 90°-scattering configuration and assigned to specific modes of vibration according to the polarization selection rule in Brillouin scattering. The elastic constants are determined from Brillouin shifts. The absolute photoelastic constants are obtained by the comparison of Brillouin intensities measured in CdIn2S4 with those in fused quartz under the same experimental conditions. The results are: C11=12.15±0.10, C12=2.46±0.46, and C44=2.57±0.05 in unit of 1010 N/m2, and P11=0.027±0.006, P12=0.093±0.005, and P44=−0.033±0.002.

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