標題: Abnormal polarization switching phenomenon in a-plane AlxGa1-xN
作者: Huang, Huei-Min
Huang, Hung-Hsun
Wu, Yuh-Renn
Lu, Tien-Chang
照明與能源光電研究所
光電工程學系
Institute of Lighting and Energy Photonics
Department of Photonics
公開日期: 11-Oct-2010
摘要: The optical polarization properties of a-plane AlxGa1-xN films have been investigated by polarization-dependent photoluminescence (PL). The degree of polarization decreased with increasing the Al composition, and the main optical polarization direction switched from epsilon perpendicular to c to epsilon // c at about x = 0.07 due to the valence band switching, representing that the optical transition energy of epsilon // c is surpassing that of epsilon perpendicular to c. However, with the Al composition larger than x = 0.1, the higher energy optical transitions of epsilon // c exhibited the stronger PL intensity, opposite to the normal situations that higher energy states commonly have weaker PL intensity than the lower energy states. We utilized the 6 x 6 k.p model and the lambertian-like radiation pattern assumption to explain this abnormal optical polarization switching behavior in the a-plane AlxGa1-xN layers and obtained good agreement with the experimental results. (C) 2010 Optical Society of America
URI: http://dx.doi.org/10.1364/OE.18.021743
http://hdl.handle.net/11536/150125
ISSN: 1094-4087
DOI: 10.1364/OE.18.021743
期刊: OPTICS EXPRESS
Volume: 18
Issue: 21
起始頁: 21743
結束頁: 21749
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