Photo induced changes in the optical properties of thermally evaporated As₄₀Se₅₀Sb₁₀ films

Abstract

The thermally evaporated amorphous As40Se50Sb10 thin film of 800 nm thickness was subjected to light exposure for photo induced studies. The changes were accompanied by structural effects, which in turn, lead to changes in the optical properties. The as‐prepared and illuminated thin films were studied by Fourier Transform Infrared Spectroscopy, X‐ray Photoelectron Spectroscopy and Raman Spectroscopy. The optical band gap was reduced due to photo induced effects along with the increase in disorder. These optical properties changes are due to the change of homopolar bond densities. The core level peak shifting in XPS spectra and Raman shift supports the optical changes happening in the film due to light exposure. (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Laser‐induced optical properties change in Sb10S40Se50 chalcogenide thin films: An investigation through FTIR and XPS measurements

“…It is well established that chalcogenide glasses undergo structural changes under the action of external influences such as laser, neutron, electron, and gamma irradiation . Chalcogenide materials also have the important property that, although there are some gap states, they do not carry the traditional electron spin resonance (ESR) defect signature of unpaired spins.…”

In situlaser irradiation: the kinetics of the changes in the nonlinear/linear optical parameters of As50Se40Sb10thin films for photonic applications

“…24 Pradhan et al have studied the in situ kinetics of the linear optical changes in As 40 Se 53 Sb 07 films 5 and the ex situ 3 rd order nonlinearity change. 25 Though ex situ linear and nonlinear optical properties have been studied to some extent, 26,27 the in situ nonlinear/linear dynamic response of the As–Se–Sb materials upon laser irradiation is very rare. We have employed the in situ pump-probe method to observe and correlate the linear and non-linear optical constants with laser irradiation time which brings out the detailed kinetics of such changes for various optical applications.…”