期刊
NANOSCALE RESEARCH LETTERS
卷 9, 期 -, 页码 -出版社
SPRINGER
DOI: 10.1186/1556-276X-9-657
关键词
Semiconductor quantum dots; Lasers; Microcavities; Microdisks; Microrings
资金
- Russian Foundation for Basic Research
- Programs of Fundamental Studies of the Russian Academy of Sciences
- Government of Russian Federation [074-U01]
- Academy of Finland [267270]
Ultrasmall microring and microdisk lasers with an asymmetric air/GaAs/Al0.98Ga0.02As waveguide and an active region based on InAs/InGaAs/GaAs quantum dots emitting around 1.3 mu m were fabricated and studied. The diameter D of the microrings and microdisks was either 2 or 1.5 mu m, and the inner diameter d of the microrings varied from 20% to 70% of the outer diameter D. The microring with D = 2 mu m and d = 0.8 mu m demonstrated a threshold pump power as low as 1.8 mu m at room temperature. Lasing was observed up to 100 degrees C owing to the use of quantum dots providing high confinement energy both for electrons and holes. Tuning spectral positions of the whispering gallery modes via changing the inner diameters of the microrings was demonstrated.
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