Nonlinear Optical Absorption Characteristics of Metal Selenides

Abstract

Metal chalcogenides are a class of materials which have attracted researchers newlineinterest and have a variety of applications in photovoltaics, thermoelectrics, newlinesensors, etc. In this doctoral research work, we have investigated the nonlinear newlineoptical absorption characteristics of three nanostructured metal chalcogenides, newlinespecifically, Iron selenide (FeSe2), Copper selenide (Cu2Se) and Antimony newlineselenide (Sb2Se3) for their potential optical power limiting applications. These newlineselenides have been synthesized through hydrothermal/solvothermal method and newlinecharacterized using powder X-ray diffraction, transmission electron microscopy, newlineand energy dispersive X-ray spectroscopy. Optical band gaps for these materials newlinewere calculated using UV-Visible absorption spectroscopy. Open-aperture z-scan newlinetechnique was employed to study the optical nonlinear absorption characteristics newlineof the synthesized samples in the nanosecond and femtosecond (ultrafast) newlineexcitation regime. The mechanism of nonlinear absorption was deciphered using newlinenumerical simulations. newline