標題: Demonstration of polarization control GaN-based micro-cavity lasers using a rigid high-contrast grating reflector
作者: Chang, Tsu-Chi
Kuo-Bin Hong
Kuo, Shuo-Yi
Lu, Tien-Chang
光電工程學系
Department of Photonics
公開日期: 10-Sep-2019
摘要: We reported on GaN microcavity (MC) lasers combined with one rigid TiO2 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(2) 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 degrees (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.
URI: http://dx.doi.org/10.1038/s41598-019-49604-0
http://hdl.handle.net/11536/152883
ISSN: 2045-2322
DOI: 10.1038/s41598-019-49604-0
期刊: SCIENTIFIC REPORTS
Volume: 9
起始頁: 0
結束頁: 0
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