Search

Chalcogenide glasses (ChG) has emerged as important materials due to their potential applications in infrared optics for communication, imaging, limiting, remote sensing and laser power delivery etc . Examining ChG for their various applications, different properties of these were under immense investigation by various researchers from nearly every part of the world. Study of ChG for optical properties like optical band gap and refractive index are the backbone while considering them for applications. The present review focuses on the optical properties of various binary, ternary and quaternary chalcogenide systems. Subsequently applications and future prospects of ChG have been sketched. The attracting prospective applications have drive us to put the review on optical properties of chalcogenide thin films both comprehensive and expedient to new as well as established researchers in this area. [ABSTRACT FROM AUTHOR]

Transmission spectra (400–1500 nm) of thermally evaporated amorphous [(As2Se3)90Ge10]95M5 thin films have been analyzed to study the effect of impurities (M = Cd and Pb) on their optical properties. The refractive index increases with addition of metal impurities. The dispersion of refractive index has been studied using Wemple–DiDomenico single oscillator model. The optical gap has been estimated using Tauc’s extrapolation and was found to decrease with the addition of metal impurities from 1.46 to 1.36 eV (Cd) and 1.41 eV (Pb) with an uncertainty of ±0.01 eV. The change in optical properties with metal impurities has been explained on the basis of density, polarizability and bond energy of the system. [ABSTRACT FROM AUTHOR]

The effect of deposition parameters, i.e. type of substrate (microscope glass, quartz and mica) and thickness (500 nm, 800 nm and 1100 nm), on the optical properties of Ge10Se90-xTex (x = 0, 10, 20, 30, 40, 50) thin films was investigated. Thin films were deposited by the vacuum evaporation technique at a base pressure 10-4 Pa. Optical transmission measurements were used to determine the refractive index (n) and optical energy gap [image omitted]. Transmission spectra were obtained in the spectral range 400-1500 nm. With an increase of film thickness, the optical energy gap was found to increase, whereas no significant change was observed for the refractive index within experimental error. For different substrates used in deposition of the thin films, the refractive index follows the order nmica > nmicroscope glass > nquartz. The optical energy gap of films deposited on mica substrate is the smallest, whereas for microscope glass and quartz substrates it remains nearly the same. [ABSTRACT FROM AUTHOR]