Multiwavelength ultralow-threshold lasing in quantum dot photonic crystal microcavities.
We demonstrate multiwavelength lasing of resonant modes in linear (L3) microcavities in a triangular-lattice 2D photonic crystal (PC) slab. The broad spontaneous emission spectrum from coupled quantum dots, modified by the PC microcavity, is studied as a function of the intensity of incident optical excitation. We observe lasing with an ultralow-threshold power of approximately 600 nW and an output efficiency of approximately 3% at threshold. Two other resonant modes exhibit weaker turnon characteristics and thresholds of approximately 2.5 and 200 microW, respectively.
Chakravarty
S
S
Solid State Electronics Laboratory, Department of Electrical Engineering and Computer Science, University of Michigan 48109-2122, USA. chakrast@umich.edu
Bhattacharya
P
P
Chakrabarti
S
S
Mi
Z
Z