Journal
CHINESE PHYSICS LETTERS
Volume 39, Issue 12, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/0256-307X/39/12/123401
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Funding
- State Key Laboratory of Luminescence and Applications [SKLA-2021-04]
- Foundation of Jiangsu Provincial Double-Innovation Doctor Program [30644]
- Natural Science Foundation of Jiangsu Province [BK20215093]
- Research Start-up Fund [NY219147, NY220181]
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [SJCX21_0267, SJCX22_0279]
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In this study, the effect of microdisk thickness on device characteristics was investigated by fabricating microdisk devices with different thicknesses. The results showed that decreasing the thickness led to modulation of lasing modes, decrease in lifetime, and changes in the Q factor of the devices.
Optical gain and loss of microcavity greatly affect the quality of lasing, how to improve optical gain and decrease optical loss is of great significance for the preparation of laser. In this study, four types standard microdisks with different thicknesses of 2.2 mu m, 1.9 mu m, 1.7 mu m, and 1.45 mu m were fabricated by micromachining technology process to modulate optical gain and loss of microdisk lasing. The whispering gallery mode lasing in the ultraviolet range of GaN microdisk devices was investigated for these devices in order to clarify the effect of microdisk thickness on device characteristics. The quality factor Q and lasing mode number for different thicknesses are calculated from the stimulated spectra. The lifetimes of the exciton combination properties of the devices were observed using time-resolved PL spectroscopy. The lasing modes are modulated, and the lifetime decreases, while the Q factor of the devices first increases and then decreases with decreasing thickness. All these results are induced by optical gain and loss competition.
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