Double-triangular whispering-gallery mode lasing from a hexagonal GaN microdisk grown on graphene

• 作者: Geng He Feifei Qin Chunxiang Xu Chinhua Wang Yu Xu Bing Cao Ke Xu
• 来源期刊: 材料科学技术（英文版）
• 年，卷（期）: 2020,（18）
• 页码范围: 140-145
• 页数: 6页
• 语种: 英文

摘要

The Ⅲ-nitride semiconductor microdisk laser exhibits high quality factor and low excitation threshold with broad development potential in the field of nanophotonics such as nanoscale light-emitting devices and on-chip optical integration.So far,many works have been focused on process synthesis and nanos-tructural design of microdisk lasers.Nevertheless,there are still some limitations in the existing optical resonance mode which is an important internal influence factor for lasing characteristics.In this work,a new double-triangular whispering-gallery mode (D3-WGM) lasing from a hexagonal GaN microdisk with a high quality (Q) factor of 3049 and an excitation threshold of around 11.5 μW has been experimen-tally demonstrated.In addition,the optical properties of hexagonal-WGM (6-WGM),triangular-WGM(3-WGM) and D3-WGM lasing from microdisk are explored by numerical calculation and Comsol sim-ulation.These results confirm that the D3-WGM lasing has its own significant performance advantages,namely high Q factor and easy light emission.Based on this novel laser mode characteristic,microcavity lasers are expected to be further developed and applied in the field of nanophotonics.