Ultrasmall microdisk and microring lasers based on InAs/InGaAs/GaAs quantum dots.
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.
78.67.Hc; 42.55.Sa; 42.50.Pq; 78.55.Cr.
St. Petersburg Academic University, St. Petersburg, 194021, Russia, maximov@beam.ioffe.ru.
Mikhail V
MV
Maximov
Natalia V
NV
Kryzhanovskaya
Alexey M
AM
Nadtochiy
Eduard I
EI
Moiseev
Ivan I
II
Shostak
Andrey A
AA
Bogdanov
Zarina F
ZF
Sadrieva
Alexey E
AE
Zhukov
Andrey A
AA
Lipovskii
Denis V
DV
Karpov
Janne
J
Laukkanen
Juha
J
Tommila