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Optical properties of amorphous As45S15Se40 thin films

M. S. IOVU1,* , I. A.COJOCARU1, V. G. BENEA1, E. P. COLOMEICO1

Affiliation

  1. Institute of Applied Physics, Academy of Sciences of Moldova, Str. Academiei 5, MD-2028, Chisinau, R. Moldova

Abstract

The experimental investigations of the influence of the light irradiation on the optical parameters of one of highest sensitive chalcogenide glass [(As40S60)0.5:(As40Se60)0.5]0.5:(As50Se50)1.0 was investigated. For the amorphous As45S15Se40 thin films, prepared by „flash” thermal evaporation, from the transmission spectra the value of the refractive index n was found n=2.921 at λ=650 nm, and the optical band gap Eg was determined from the Tauc plot Eg=1.929 eV. The kinetics of photodarkening in amorphous As45S15Se40 thin films is described by stretch exponential function and the effect at illumination with laser beam λ=540 nm is more pronounced that in amorphous As2S3 and As2Se3 films. The maximum of the diffraction efficiency η of the holografical gratings recorded during the exposure of laser beam at λ=540 nm is reached at about t=250 s..

Keywords

Chalcogenide glass, amorphous films, optical transmission, holography.

Submitted at: May 5, 2011
Accepted at: Nov. 23, 2011

Citation

M. S. IOVU, I. A.COJOCARU, V. G. BENEA, E. P. COLOMEICO, Optical properties of amorphous As45S15Se40 thin films, Journal of Optoelectronics and Advanced Materials Vol. 13, Iss. 11-12, pp. 1412-1416 (2011)