Light scattering by dislocations in group-III nitrides
| Autor: | Yury Georgievich Shreter, Y. T. Rebane, Ruslan Gorbunov |
|---|---|
| Rok vydání: | 2005 |
| Předmět: |
business.industry
Scattering Chemistry Optical polarization Surfaces and Interfaces Condensed Matter Physics Molecular physics Ray Light scattering Surfaces Coatings and Films Electronic Optical and Magnetic Materials Condensed Matter::Materials Science Optics Absorption edge Materials Chemistry Light beam Electrical and Electronic Engineering Dislocation business Burgers vector |
| Zdroj: | physica status solidi (a). 202:2880-2887 |
| ISSN: | 1862-6300 |
| DOI: | 10.1002/pssa.200421095 |
| Popis: | Light scattering by dislocations in group-III nitrides has been studied. The effects of dislocation strain field and hollow cores on light scattering have been investigated. It is found that the coreless edge dislocation and the edge dislocations with hollow cores both participate in light scattering. Screw dislocations contribute to light scattering only if they have hollow cores. Analytical expressions for differential cross sections of light scattering by edge and screw dislocations have been obtained. Transport cross sections for in-plane and transversal light polarizations have been calculated. Calculated spectral dependencies of the scattering cross sections show significant resonant enhancement of the light scattering in the vicinity of the absorption edge. An angle diffusion coefficient of light beam directions has been obtained that can be used for experimental determination of density, Burgers vectors and core radii of threading dislocations in III-nitride crystals by optical means. In crystal films with high dislocation density the exponential decay of laterally propagating light rays resulting from scattering by dislocations can exceed the decay related to light absorption. (© 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) |
| Databáze: | OpenAIRE |
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