Abstract
The photo-darkening (PD) process in annealed As 2S 3 films was analyzed by monitoring the change in optical transmittance and optical anisotropy. We observed the laser-induced optical anisotropic darkening, at T=300K and T=80K. At T=80°K, the PD process becomes faster with higher photon injection, but the anisotropic effect is enhanced at lower photon injection. The low-T behavior of PD kinetics is explained in terms of the anisotropic yield which suggests local directional stability in a randomly distorted glassy network.
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