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Title: Polarization ratio enhancement of a-plane GaN light emitting diodes by asymmetric two-dimensional photonic crystals

Abstract

Fabricating photonic crystals (PhCs) on GaN based non-polar light emitting diodes (LEDs) is an effective way to increase light extraction and meanwhile to preserve or improve polarization ratio. In this work, a-plane GaN LEDs with two-dimensional PhCs were demonstrated. With the E // m polarized modes (which mean the optical polarization with the electric field parallel to m-axis) as the target of diffraction, we matched E//m modes to the photonic bands and aligned E//c modes to fall within the photonic band gap. The results show stronger E//m but weaker E//c mode diffractions on both c- and m-axes. At the vertical direction, the polarization ratio is enhanced from 45.8% for the planar device to 52.3% for the LEDs with PhCs.

Authors:
; ; ; ; ; ; ;  [1]
  1. Department of Photonics and Electro-Optical Engineering, National Chiao-Tung University, Hsinchu, Taiwan (China)
Publication Date:
OSTI Identifier:
22275514
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 115; Journal Issue: 19; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ASYMMETRY; CRYSTALS; DIFFRACTION; ELECTRIC FIELDS; ELECTRONIC STRUCTURE; GALLIUM NITRIDES; LIGHT EMITTING DIODES; PHOTONS; POLARIZATION; VISIBLE RADIATION

Citation Formats

Chou, Yen, Li, Hsiang-Wei, Yin, Yu-Feng, Wang, Yu-Ting, Lin, Yen-Chen, Wu, Yuh-Renn, Huang, Jian Jang, E-mail: jjhuang@ntu.edu.tw, Lin, Da-Wei, and Kuo, Hao-Chung. Polarization ratio enhancement of a-plane GaN light emitting diodes by asymmetric two-dimensional photonic crystals. United States: N. p., 2014. Web. doi:10.1063/1.4876655.
Chou, Yen, Li, Hsiang-Wei, Yin, Yu-Feng, Wang, Yu-Ting, Lin, Yen-Chen, Wu, Yuh-Renn, Huang, Jian Jang, E-mail: jjhuang@ntu.edu.tw, Lin, Da-Wei, & Kuo, Hao-Chung. Polarization ratio enhancement of a-plane GaN light emitting diodes by asymmetric two-dimensional photonic crystals. United States. https://doi.org/10.1063/1.4876655
Chou, Yen, Li, Hsiang-Wei, Yin, Yu-Feng, Wang, Yu-Ting, Lin, Yen-Chen, Wu, Yuh-Renn, Huang, Jian Jang, E-mail: jjhuang@ntu.edu.tw, Lin, Da-Wei, and Kuo, Hao-Chung. 2014. "Polarization ratio enhancement of a-plane GaN light emitting diodes by asymmetric two-dimensional photonic crystals". United States. https://doi.org/10.1063/1.4876655.
@article{osti_22275514,
title = {Polarization ratio enhancement of a-plane GaN light emitting diodes by asymmetric two-dimensional photonic crystals},
author = {Chou, Yen and Li, Hsiang-Wei and Yin, Yu-Feng and Wang, Yu-Ting and Lin, Yen-Chen and Wu, Yuh-Renn and Huang, Jian Jang, E-mail: jjhuang@ntu.edu.tw and Lin, Da-Wei and Kuo, Hao-Chung},
abstractNote = {Fabricating photonic crystals (PhCs) on GaN based non-polar light emitting diodes (LEDs) is an effective way to increase light extraction and meanwhile to preserve or improve polarization ratio. In this work, a-plane GaN LEDs with two-dimensional PhCs were demonstrated. With the E // m polarized modes (which mean the optical polarization with the electric field parallel to m-axis) as the target of diffraction, we matched E//m modes to the photonic bands and aligned E//c modes to fall within the photonic band gap. The results show stronger E//m but weaker E//c mode diffractions on both c- and m-axes. At the vertical direction, the polarization ratio is enhanced from 45.8% for the planar device to 52.3% for the LEDs with PhCs.},
doi = {10.1063/1.4876655},
url = {https://www.osti.gov/biblio/22275514}, journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 19,
volume = 115,
place = {United States},
year = {Wed May 21 00:00:00 EDT 2014},
month = {Wed May 21 00:00:00 EDT 2014}
}