使用刚性高对比度光栅反射器演示基于氮化镓的偏振控制微腔激光器。

Demonstration of polarization control GaN-based micro-cavity lasers using a rigid high-contrast grating reflector.

作者信息

Chang Tsu-Chi, Hong Kuo-Bin, Kuo Shuo-Yi, Lu Tien-Chang

机构信息

Department of Photonics, College of Electrical and Computer Engineering, National Chiao Tung University, Hsinchu, 30010, Taiwan.

出版信息

Sci Rep. 2019 Sep 10;9(1):13055. doi: 10.1038/s41598-019-49604-0.

DOI:10.1038/s41598-019-49604-0

PMID:31506495

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6736857/

Abstract

We reported on GaN microcavity (MC) lasers combined with one rigid TiO high-contrast grating (HCG) structure as the output mirror. The HCG structure was directly fabricated on the GaN structure without an airgap. The entire MC structure comprised a bottom dielectric distributed Bragg reflector; a GaN cavity; and a top HCG reflector, which was designed to yield high reflectance for transverse magnetic (TM)- or transverse electric (TE)-polarized light. The MC device revealed an operation threshold of approximately 0.79 MW/cm when pulsed optical pumping was conducted using the HCG structure at room temperature. The laser emission was TM polarized with a degree of polarization of 99.2% and had a small divergence angle of 14° (full width at half maximum). This laser operation demonstration for the GaN-based MC structure employing an HCG exhibited the advantages of HCGs in semiconductor lasers at wavelengths from green to ultraviolet.

摘要

我们报道了一种氮化镓微腔（MC）激光器，其将一种刚性二氧化钛高对比度光栅（HCG）结构用作输出镜。该HCG结构直接制作在氮化镓结构上，没有气隙。整个MC结构包括一个底部介质分布式布拉格反射器、一个氮化镓腔以及一个顶部HCG反射器，后者被设计用于产生对横向磁（TM）极化光或横向电（TE）极化光的高反射率。当在室温下使用HCG结构进行脉冲光泵浦时，该MC器件显示出约0.79兆瓦/平方厘米的工作阈值。激光发射为TM极化，极化度为99.2%，并且具有14°的小发散角（半高宽）。这种采用HCG的基于氮化镓的MC结构的激光操作演示展示了HCG在从绿色到紫外波长的半导体激光器中的优势。