Spectra of natural and photoinduced linear dichroism in chalcogenide glasses

Abstract Spectra of natural and photoinduced linear dichroism in the range of 570 to 630 nm are investigated for the first time in some bulk chalcogenide glasses of various composition. In As34S52I14 and As2S3 glasses, the natural dichroism is shown to be positive, small and approximately constant in the whole spectral range studied. The dichroism induced by the sub-band-gap light beam is negative, large and has substantial spectral selectivity. The form of the dichroism spectrum changes during the inducing time, and the dichroism maximum shifts gradually to the shorter wavelengths range towards the wavelength of inducing light. In GeS2.2 glass, the form of dichroism is determined by the natural dichroism that changes value and sign in the spectral range studied. The results are discussed taking into consideration the interaction of linearly polarized light with the anisotropic defects distributed energetically in the gap of the glass.

[1]  M. Paesler,et al.  Kinetics of laser-induced phenomena in glassy As2S3 , 1987 .

[2]  S. A. Dembovsky.  Chiral and dipolar centres in inorganic glass formers. Anisotropy and gyrotropy in glass , 1992 .

[3]  S. Rosenwaks,et al.  Anisotropy of photoinduced light-scattering in glassy As2S3 , 1993 .

[4]  B. T. Kolomiets,et al.  Photoinduced Optical Anisotropy in Chalcogenide Vitreous Semiconducting Films , 1979, April 16.

[5]  V. Lyubin,et al.  Intrinsic and photoinduced elliptical dichroism and birefringence in glassy semiconductors , 1991 .

[6]  M. Vlcek,et al.  Model of photoinduced changes of optical properties in amorphous layers and glasses of Ge-Sb-S, Ge-S, As-S and As-Se systems , 1987 .

[7]  S. R. Elliott,et al.  Medium-range structural order in covalent amorphous solids , 1991, Nature.

[8]  K. Oe,et al.  A reversible optical transition in SeGe and PSeGe glasses , 1976 .

[9]  V. K. Tikhomirov,et al.  Photodarkening and photoinduced anisotropy in chalcogenide vitreous semiconductor films , 1989 .

[10]  H. Fritzsche,et al.  The origin of photo-induced optical anisotropies in chalcogenide glasses☆ , 1993 .

[11]  D. Sayers,et al.  Kinetic X-ray absorption studies and computer structural modelling of photo-darkening in amorphous arsenic sulfide , 1990 .

[12]  V. K. Tikhomirov,et al.  Novel photo-induced effects in chalcogenide glasses , 1991 .

[13]  J. Tauc,et al.  Optical and Magnetic Investigations of the Localized States in Semiconducting Glasses , 1970 .