Browsing by Author "Lai, Chih Ming"

Now showing 1 - 1 of 1

Characteristics of Polarized Light Emission in a-Plane GaN-Based Multiple Quantum Wells
(2012-07-01)
Chang, Chiao-Yun
;
Huang, Huei-Min
;
Lai, Chih Ming
;
Lu, Tien-Chang
;
光電工程學系
In this paper, we investigated polarized light emission properties on a series of a-plane GaN/AlGaN multiple quantum wells grown on r-plane sapphire substrates with various well widths by using the polarization-dependent photoluminescence measurement. To clarify reasons of polarization properties in light emission, we applied the 6 x 6 k.p model to simulate the E-K dispersion relationship and wave functions to obtain optical transitions of different polarized emissions. According to our results, the sub-bands of vertical bar Y>-like states are raised toward the top of the valence sub-band level with increasing the well width. And the optical matrix element of y-polarized light emission will dominate the optical transition, leading to the increase of degree of polarization in the thicker well.