Ultrasmall microdisk and microring lasers based on InAs/InGaAs/GaAs quantum dots.

Autor: Maximov MV; St. Petersburg Academic University, St. Petersburg, 194021, Russia, maximov@beam.ioffe.ru., Kryzhanovskaya NV, Nadtochiy AM, Moiseev EI, Shostak II, Bogdanov AA, Sadrieva ZF, Zhukov AE, Lipovskii AA, Karpov DV, Laukkanen J, Tommila J
Jazyk: angličtina
Zdroj: Nanoscale research letters [Nanoscale Res Lett] 2014 Dec; Vol. 9 (1), pp. 3266. Date of Electronic Publication: 2014 Dec 04.
DOI: 10.1186/1556-276X-9-657
Abstrakt: 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 μm were fabricated and studied. The diameter D of the microrings and microdisks was either 2 or 1.5 μm, and the inner diameter d of the microrings varied from 20% to 70% of the outer diameter D. The microring with D = 2 μm and d = 0.8 μm demonstrated a threshold pump power as low as 1.8 μW at room temperature. Lasing was observed up to 100°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.
Pacs: 78.67.Hc; 42.55.Sa; 42.50.Pq; 78.55.Cr.
Databáze: MEDLINE
Externí odkaz: