Abstract
Bulk glasses of Se75 In25-x Pbx (when n = 0, 4, 6, 10) systems and thin films have been prepared by the conventional melt quenching technique and by thermal evaporation technique, respectively. The optical constants (absorption coefficient (α), refractive index (n), extinction coefficient (k)) have been studied for Se-In-Pb thin films as a function of photon energy in the wavelength range (300-900 nm). Spectral dependence of transmittance (T) and reflectance (R) in the spectral range (300-900 nm) of glass Se-In-Pb have also been observed at various concentrations of Te and Pb. The effect of compositional variation on some optical constant has been observed and discussed in the present investigation. Key words: optical constants, thin films, chalcogenide glasses.
Highlights
Chalcogenide glasses have been studied intensively in the last few years owing to their interesting properties and technological applications (Al-Ghamdi, 2006)
In this paper we systematically studied the chemical modification of Se75 In25 - x Pbx glass system incorporated with Pb
4% of Pb concentration in Se75 In25-x Pbx; with further increase of Pb content, the optical band gap decreases in the present system
Summary
Chalcogenide glasses have been studied intensively in the last few years owing to their interesting properties and technological applications (Al-Ghamdi, 2006). They are materials used in optical and photonic devices. They have good electro-optic, thermo-optic, magneto-optic, acousto-optic properties, high refractive index (Barman and Sharma, 2013) and I R transparency (Zakery and Elliott, 2003). The development of laser technology had opened up new application for narrow gap lead salts and their alloys. The polycrystalline thin films were deposited onto optically plane and chemically clean glass substrates by vacuum evaporation technique. X-ray diffraction technique and current–voltage characteristics method were used to characterize the films
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