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- Title
Pulsed light effects in amorphous As<sub>2</sub>S<sub>3</sub>: review.
- Authors
Tanaka, Keiji; Saitoh, Akira
- Abstract
It is known that amorphous chalcogenide materials exhibit unique optical phenomena, including high nonlinearity, photodarkening, and phase changes. Upon single or repeated, pulsed excitations, these phenomena induce changes in optical properties and/or macroscopic shapes, which are promising for applications to photonic devices and micro-fabrications. We consider comprehensively the fundamentals of such pulse-induced phenomena appearing in sulfides (and selenides), which may be contrastive to the opto-thermal phase change in telluride films. The optical nonlinearity works as refractive-index switches with fs response times, transient absorption could operate as optical switches, and photodarkening-related effects can be applied to memories. Besides, damages produced by intense pulses may be useful for micro-fabrications. These responses are feasible at the optical communication wavelength, ~ 1.55 μm, where the materials are transparent. However, roles of band-edge and -gap states remain to be explored. Pulsed excitations would also produce noticeable temperature rises, for which a simple evaluation scheme is presented.
- Subjects
OPTICAL communications; OPTICAL switches; MICROFABRICATION; AMORPHOUS substances; OPTICAL properties; SELENIDES
- Publication
Journal of Materials Science: Materials in Electronics, 2022, Vol 33, Issue 28, p22029
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-022-08989-x