Tunable luminescence and nonlinear optical properties of nano colloidal Ge20Te75Bi5 chalcogenide glass. (January 2023)

• Record Type: Journal Article
• Authors: Gadhwal, Reena; Singh, Hukum; Devi, Ambika; Kumar, Kapil
• Is Part Of: Optics & laser technology. Volume 157(2023)
• Publication Date: 2023-01
• Subjects: Nano colloids -- Photoluminescence -- Chalcogenide glass -- Optical limiting -- Nonlinear absorption; Optics -- Periodicals; Lasers -- Periodicals; Electronic journals; 621.366
• DOI: 10.1016/j.optlastec.2022.108665
• Languages: English
• ISSNs: 0030-3992

Abstract

Highlights: Optical grade thin films fabricated from nano colloidal solutions of Ge20 Te75 Bi5 chalcogenide glass are studied. Emission peaks of varying concentrations of Ge20 Te75 Bi5 nanocomposites shift from 426 nm to 492 nm. The optical band gap is tunable between 2.66 eV and 3.01 eV. The nonlinear absorption mechanism originating from the effective TPA process is evident in the open aperture z-scan traces. Abstract: In this article, we report spectral studies and optical nonlinearities of optical grade thin films fabricated from nano colloidal solutions of Ge20 Te75 Bi5 chalcogenide glass. Emission peaks of varying concentrations of Ge20 Te75 Bi5 nanocomposites shift from 426 nm to 492 nm. Bandgap Eg also varies in the proportion tunable to emission peaks depending on the grain size of the films. The existence of reverse saturable absorption (RSA) is confirmed by the open aperture z-scan traces of nanocomposites with a valley-like pattern. Enhancement of third-order optical nonlinearities in Ge20 Te75 Bi5 chalcogenide nano colloids studied using the z-scan technique can be exploited to improve the desirable features for usage in nonlinear optical systems.