Reversible photostructural change in chalcogenide glass films observed in infrared absorption spectra

Measurement of infrared absorption spectra in amorphous chalcogenide films revealed changes which can be closely related with the reversible photostructural change. The changes came out in intensity of absorption peak situated near 650 cm^-1 as well as definite change in infrared fundamental absorption peak. The absorption peak intensity near 650 cm^-1 showed considerable decrease by annealing, while it recovered initial value after light exposure. The change was shown to be in close correspondence with the well known reversible optical absorption edge shift.