Article ID Journal Published Year Pages File Type
5370379 Applied Surface Science 2006 5 Pages PDF
Abstract

The influence of size and shape for nanocrystallines (NC) of semiconducting materials (like GaN, ZnO, CdS, ZnS with sizes about 20-30 nm) incorporated into olygoetheracrylate polymer matrices on photoinduced optical properties, particularly the two-photon absorption (TPA), was investigated. We have shown that maximal values of the TPA diagonal tensor component was observed at low temperatures for the GaN NC (about 4.2 K), which corresponds to a NC concentration of 2.6-3.2 wt.% and size of about 24 nm. The shape and value of ellipticity play crucial roles in the observed non-linear optical phenomena. This contradicts the generally adopted model wherein the non-linear optical properties are mainly determined by averaged NC sizes. The observed temperature dependence is explained within a framework of anharmonic electron-phonon interaction in the large-sized nanocrystallites.

Related Topics
Physical Sciences and Engineering Chemistry Physical and Theoretical Chemistry
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