Abstract
It is shown from lattice dynamical calculations that an externally applied field can induce measurable changes in the photoelastic constants and the piezo-optical coefficients of diamond, in the region of the long-wavelength optical phonon at 1332 cm-1. This in turn may lead to narrow resonances or antiresonances of the Brillouin scattering efficiency when the incident radiation is chosen to be in the vicinity of the phonon frequency. The field may also induce Brillouin scattering in configurations which are normally forbidden. In all these calculations the phonon linewidth is taken into account explicitly. Assuming a value of 103 esu for the electric field, the complete dispersion curves are plotted in the region of 1332 cm-1, for the photoelasticity constants, the elasto-optical coefficients and the Brillouin scattering efficiency in allowed and forbidden configurations.
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