Preprint Review Version 1 Preserved in Portico This version is not peer-reviewed

Lightinduced Effects in Amorphous Chalcogenide Glasses: Femtoseconds to Seconds

Version 1 : Received: 27 February 2021 / Approved: 2 March 2021 / Online: 2 March 2021 (09:33:44 CET)

A peer-reviewed article of this Preprint also exists.

Khan, P.; Adarsh, K.V. Light-Induced Effects in Amorphous Chalcogenide Glasses: Femtoseconds to Seconds. Physics 2021, 3, 255-273. Khan, P.; Adarsh, K.V. Light-Induced Effects in Amorphous Chalcogenide Glasses: Femtoseconds to Seconds. Physics 2021, 3, 255-273.

Journal reference: Physics 2021, 3, 19
DOI: 10.3390/physics3020019

Abstract

Amorphous chalcogenide (ChGs) glasses are intrinsically metastable, highly photosensitive, and therefore exhibit numerous lightinduced effects upon bandgap and sub-bandgap illumination. Depending on the pulse duration of the excitation laser, ChGs exhibit a series of lightinduced effects spanning over femtosecond to seconds time domain. For continuous wave illumination, the effects are dominantly metastable in terms of photodarkening (PD) and photobleaching (PB) that takes place via homopolar to heteropolar bond conversion. On the other hand, under nanosecond and ultrafast pulsed illumination, ChGs exhibit transient absorption (TA) that is instigated from the transient bonding rearrangements through self-trapped exciton recombination. In the first part of the review, we pay special attention to continuous wave lightinduced PD and PB, while in the second part we will focus on the TA and controlling such effects via internal and external parameters e.g., chemical composition, temperature, sample history etc.

Keywords

chalcogenide glasses; pump-probe; photodarkening; photobleaching; transient absorption, network rigidity

Subject

PHYSICAL SCIENCES, Acoustics

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