Abstract

In studying the optical-transmission properties of the glassy crystalline chalcogenide composition ${\mathrm{As}}_{4}{\mathrm{Se}}_{3}$ with polarized light, we have observed a photoinduced phenomenon, called here negative vectoral photoinduced anisotropy. The negative anisotropy is ascribed to ${\mathrm{As}}_{4}{\mathrm{Se}}_{3}$ molecular units embedded in an amorphous network. During the course of illumination, the negative anisotropy gradually decreases in amplitude and is replaced by the well-known, previously observed positive vectoral anisotropy. A microscopic mechanism for the occurrence of negative anisotropy is suggested.

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