Polarization-Dependent Sidewall Light Diffraction of LEDs Surrounded by Nanorod Arrays
Journal
IEEE Photonics Technology Letters
Journal Volume
21
Journal Issue
22
Pages
1683--1685
Date Issued
2009-11
Author(s)
Kun-Mao Pan
Yun-Wei Cheng
Liang-Yi Chen
Ying-Yuan Huang
Min-Yung Ke
Cheng-Pin Chen
Yuh-Renn Wu
JianJang Huang
Abstract
The polarization behavior of the light-emitting diodes (LEDs) with nanorods surrounding the p-mesa is investigated. The nanorods were fabricated using a natural nanosphere lithography and are intended to diffract laterally propagated light. In the horizontal direction, s-polarized light is dominated since the injected carriers choose to fill up the lowest energy state in a direction parallel to the quantum-well layers. The p/s-polarized ratio starts to increase with the increase of radiated angles and eventually saturates. Since the Bragg diffraction of laterally propagated p-polarized mode by nanorods is more efficient than the s-polarized light, the p/s-ratio of the device with nanorods is higher than that without rods. The p/s-ratio of the LED with nanorods is 1.96 at 90, and is 1.52 when the integrating intensity between 0 and 90 is considered.
SDGs
Type
journal article