Photo-induced transformations in chalcogenide nanocomposite layers

Photo- and thermally induced interdiffusion in Se/As2S3 nanomultilayers prepared by pulsed laser deposition and thermal evaporation

“…Fig. 4), while the surface of the CTE NML remains smooth (except of special conditions, when the crystallization of Se may occur [13]). The average volume expansion due to the irradiation-induced interdiffusion is smaller (% 4%) in the investigated PLD samples in comparison with CTE ones (% 10%).…”

Stimulated interdiffusion and optical recording in Sb/As2S3 nanomultilayers

“…So the interdiffusion of the given metals and As 2 S 3 differs from the known interdiffusion of Se, chalcogenides with As 2 S 3 [5][6][7] and provides possibility to create pure amplitude-phase relief without local thickness change, which can be a source of additional noises in volume hologram recording [11].…”

“…The absence of light-stimulated expansion in Sb/As 2 S 3 samples which is usually very pronounced and large in chalcogenide-chalcogenide NMLs [6,7] may be attributed to the specific character of new chemical bond formation due to the interdiffusion of Sb and As 2 S 3 . Preliminary XPS data reveal appearance of pure As which contributes to the formation of Sb-S bonds instead of As-S, resulting the formation of Sb 2 S 3 molecules and clusters and possible enrichment of the layer by As or arsenic oxide molecules (at the surface) without noticeable change of the volume.…”

“…This process can be extended even to the Ag/ChG nanomultilayers (NML) [4], but the experiments reveal unstability of both initial structures in respect of degradation due to the fast diffusion of silver to chalcogenides, that do not favors one-step recording of necessary optical relief. Remarkable results were achieved in a one-step direct optical recording-relief creation in Se/As 2 S 3 type NMLs [5][6][7]. The recording can be further developed in Bi/As 2 S 3 -type NMLs [8], which seems to be stable at normal environment conditions and can be used for direct optical recording-readout, but the solubility of Bi in As 2 S 3 is rather slow and small [9] that can result crystallization effects in the intermixed layer and decrease the quality of the recording media.…”