Comprehensive Control of Optical Polarization Anisotropy in Semiconducting Nanowires

Details Comprehensive Control of Optical Polarization Anisotropy in Semiconducting Nanowires Comprehensive Control of Optical Polarization Anisotropy in Semiconducting Nanowires

2011-07-30

arxiv.org/abs/1108.0033v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

The demonstration of strong photoluminescence polarization anisotropy in semiconducting nanowires embodies both technological promise and scientific challenge. Here we present progress on both fronts through the study of the photoluminescence polarization anisotropy of randomly oriented nanowire ensembles in materials without/with crystalline anisotropy, small/wide bandgap, and both III-V/II-VI chemistry (InP/ZnO nanowires, respectively). Comprehensive control of the polarization anisotropy is realized by dielectric matching with conformally deposited Ta2O5 (dielectric ratios of 9.6:4.41 and 4.0:4.41 for InP and ZnO, respectively). After dielectric matching, the polarization anisotropy of the nanowire ensembles is reduced by 86% for InP:Ta2O5 and 84% for ZnO:Ta2O5.

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