Optical properties of GexAsxSe1-2x glasses

Vasile Benea; Mihail Iovu; Eduard Colomeico; Maria Iovu; Ion Cojocaru; Oleh Shpotyuk

doi:10.1117/12.882071

3 December 2010 Optical properties of Ge_xAs_xSe_1-2x glasses

Vasile Benea, Mihail Iovu, Eduard Colomeico, Maria Iovu, Ion Cojocaru, Oleh Shpotyuk

Proceedings Volume 7821, Advanced Topics in Optoelectronics, Microelectronics, and Nanotechnologies V; 782109 (2010) https://doi.org/10.1117/12.882071
Event: Advanced Topics in Optoelectronics, Microelectronics, and Nanotechnologies, 2010, Constanta, Romania

Abstract

The optical properties of amorphous Ge_xAs_xSe_2-x (x=0.05÷0.30) thin films prepared by thermal evaporation on the glass substrates held at T_substr=100°C are reported. The transmission spectra was used for calculation of the absorption coefficient α, optical band gap E_g, and the values of the refractive index n. The dependences of α, E_g, and n on the film composition in the Ge_xAs_xSe_2-x glassy system were determined. It was established that the optical band gap E_g decreases, while the refractive index n increases with the increasing of the concentration of Ge and As in the Ge_xAs_xSe_2-x glassy system. The time dependence of the transmission T(t) during the light exposure for the above band gap illumination (photodarkening) is described by a strength exponential behaviour T(t)/T(0) = A₀+Aexp[-(t-t₀)/τ]^(1-β), where t is the exposure time, τ is the apparent time constant, A characterizes the exponent amplitude, t₀ and A₀ are the initial coordinates, and β is the dispersion parameter (0<β<1).

Citation Download Citation

Vasile Benea, Mihail Iovu, Eduard Colomeico, Maria Iovu, Ion Cojocaru, and Oleh Shpotyuk "Optical properties of Ge_xAs_xSe_1-2x glasses", Proc. SPIE 7821, Advanced Topics in Optoelectronics, Microelectronics, and Nanotechnologies V, 782109 (3 December 2010); https://doi.org/10.1117/12.882071

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