Photonic Crystal Circular Nanobeam Cavity Laser with Type-II GaSb/GaAs Quantum Rings as Gain Material

摘要： The optical emission from type-II semiconductor nanostructures is influenced by the long carrier lifetime and can exhibit remarkable thermal stability. in this study, utilizing a high quality photonic crystal circular nanobeam cavity with a high quality factor and a sub-micrometer mode volume, we demonstrated an ultra-compact semiconductor laser with type-ii gallium antimonide/gallium arsenide quantum rings (GaSb/GaAs QRs) as the gain medium. the lasing mode localized around the defect region of the nanobeam had a small modal volume and significant coupling with the photons emitted by QRs. it leads the remarkable shortening of carrier lifetime observed from the time-resolved photoluminescence (tRpL) and a high purcell factor. furthermore, a high characteristic temperature of 114 K was observed from the device. The lasing performances indicated the type-II QRs laser is suitable for applications of photonic integrated circuit and bio-detection applications.