Abstract
Micron-scale deformations produced in a chalcogenide glass, As2S3, by illumination of focused linearly polarized light have been studied comparatively with optical and structural changes. In thin samples (∼2 µm), an anisotropic deformation, which is M-shaped along the electric field of light, grows after appearances of isotropic volume expansion and negative birefringence. In thick samples (∼10 µm), only the isotropic deformation appears. The anisotropic deformation is induced by subgap illumination more efficiently at 80 K. Raman-scattering spectra suggest that the anisotropic deformation accompanies stress at hillocks in the M-shaped deformation. These observations can be accounted for by assuming that the anisotropic deformation occurs through atomic layer alignment and fluidity, both being photoinduced.
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