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SM ISO690:2012 BENEA, Vasile, YOVU, M., KOLOMEYKO, Eduard, IOVU, Maria, COJOCARU, Ion, SHPOTYUK, Oleh. Optical properties of GexAsxSe1-2x glasses. In: Proceedings of SPIE - The International Society for Optical Engineering, Ed. 5, 26-29 august 2010, Constanta. Bellingham, Washington: SPIE, 2010, Ediţia 5, Vol.7821, pp. 1-7. ISBN 9780819483300 . ISSN 0277-786X. DOI: https://doi.org/10.1117/12.882071 |
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Proceedings of SPIE - The International Society for Optical Engineering Ediţia 5, Vol.7821, 2010 |
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Conferința "Advanced Topics in Optoelectronics, Microelectronics, and Nanotechnologies" 5, Constanta, Romania, 26-29 august 2010 | |||||||
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DOI:https://doi.org/10.1117/12.882071 | |||||||
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The optical properties of amorphous GexAsxSe 2-x (x=0.05÷0.30) thin films prepared by thermal evaporation on the glass substrates held at Tsubstr=100 °C are reported. The transmission spectra was used for calculation of the absorption coefficient α, optical band gap Eg, and the values of the refractive index n. The dependences of α, Eg, and n on the film composition in the GexAsxSe2-x glassy system were determined. It was established that the optical band gap Eg decreases, while the refractive index n increases with the increasing of the concentration of Ge and As in the GexAsxSe2-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 A 0 are the initial coordinates, and β is the dispersion parameter (0<β[removed] |
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Cuvinte-cheie chalcogenide glasses, optical absorption, photodarkening, refractive index |
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