Browsing by Author "Wang, Jih-Fu Trevor"

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Polarized light emission from photonic crystal light-emitting diodes
(2008-06-16)
Lai, Chun-Feng
;
Chi, Jim-Yong
;
Yen, Hsi-Hsuan
;
Kuo, Hao-Chung
;
Chao, Chia-Hsin
We have experimentally studied polarization characteristics of the two-dimensional photonic crystal (PhC) light-emitting diodes (LEDs) using an annular structure with square lattice and observed a strong polarization dependence of the lattice constant and orientation of the PhC. The extracted light from the GaN PhC LEDs has P/S ratios of 5.5 (similar to 85% polarization light) for light propagating in the Gamma X direction and 2.1 (similar to 68% polarization light) for the Gamma M direction, respectively. Based on the couple mode theory, the dependence of polarization behaviors on different lattice constant and orientation was found to be in good agreement with theoretical discussion.