Observation of giant photodarkening and temperature mediated transition to photobleaching in As2Se3/Ag/Se trilayer
Source abstract
Abstract
Abstract In this article, we report giant photodarkening (PD) in As 2 Se 3 /Ag/Se trilayer when illuminated with 532 nm continuous wave laser. Upon illumination, absorption edge of the trilayer exhibits dramatic redshift of ~ 100 nm that is much larger than any previous results. Impressively PD is permanent in nature which contributes ~ 93% of the total change and is accompanied by a weak transient part. Further, the temperature dependent light induced studies reveal remarkably contrasting characteristics of giant PD at 20 K, which switch to weak photobleaching (PB) at 420 K. Raman study on as-prepared and illuminated samples provide new insights that illumination enhances the number of Se n chains over AsSe 3/2 . We foresee that giant PD is useful in fabricating waveguides and memory devices.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Phase-change materials and chalcogenides · Photonic and Optical Devices · Nonlinear Optical Materials Studies
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References (33)
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