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Visible Anisotropic Deformation of Chalcogenide Glass by Illumination of Linearly Polarized Light

It has been discovered that illumination of linearly-polarized bandgap light produces visible-scale anisotropic deformations in a covalent chalcogenide glass As2S3. X-ray diffraction and Raman-scattering measurements for deforming As2S3 flakes detect no microscopic structural changes. Measurements of optical torque in deforming flakes and comparative exposure experiments for crystalline As2S3 and amorphous Se suggest that the anisotropic deformation occurs through radiation force, photoinduced birefringence, and photoinduced fluidity.