標題: Far-field of GaN film-transferred green light-emitting diodes with two-dimensional photonic crystals
作者: Lai, Chun-Feng
Chi, Jim-Yong
Kuo, Hao-Chung
Yen, Hsi-Hsuan
Lee, Chia-En
Chao, Chia-Hsin
Hsueh, Han-Tsung
Yeh, Wen-Yung
光電工程學系
Department of Photonics
公開日期: 25-May-2009
摘要: Far-field distributions of GaN-based photonic crystal (PhC) film-transferred light-emitting diodes (FT-LEDs) were investigated. The thickness of the device is about 840 nm. The emission wavelength is around 520 nm. The PhC region is a square lattice with a/lambda around 0.5. Angular-resolved measurements in the Gamma-X and Gamma-M directions were made in the polarized-resolved manner. Guided mode extraction behavior in agreement with the two-dimensional free-photon band calculation was observed. In addition, the pseudo-TM behavior for the non-collinearly coupled modes was observed. The azimuthal-mapping of the angular-resolved spectra revealed the evolution of the collinearly and the non-collinearly coupled modes. Furthermore, the light enhancement of similar to 2.7x and the collimation angle about 102.3 degrees were achieved. (c) 2009 Optical Society of America
URI: http://dx.doi.org/10.1364/OE.17.008795
http://hdl.handle.net/11536/7219
ISSN: 1094-4087
DOI: 10.1364/OE.17.008795
期刊: OPTICS EXPRESS
Volume: 17
Issue: 11
起始頁: 8795
結束頁: 8804
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