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Splitting and lasing of whispering gallery modes in quantum dot micropillars.

Jones, B D*; Oxborrow, M; Astratov, V N*; Hopkinson, M*; Tahraoui, A*; Skolnick, M S*; Fox, A M* (2010) Splitting and lasing of whispering gallery modes in quantum dot micropillars. Opt. Express, 18 (21). pp. 22578-22592.

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Abstract

We have studied the whispering gallery mode (WGM) resonances of GaAs/AlGaAs microcavity pillars containing InAs quantum dots. High quality factor WGMs are observed from a wide range of pillars with diameters from 1.2 to 50µm. Multimode lasing with ultralow microwattlevel thresholds and high beta-factors approaching unity is observed under optical pumping in a 4 micron diameter pillar. Mode splitting is observed in WGMs from pillars with diameters of 5µm, 20 µm and 50µm.We develop a model in which the mode splitting in the larger pillars is caused by resonant scattering from the quantum dots themselves. The model explains why splittings are observed in all of the larger pillars and that the splitting decreases with increasing wavelength. Numerical simulations by COMSOL confirm that the model is plausible. This mechanism of splitting should be general for all circular resonant structures containing quantum dots such as microdisks, rings, toroids, and microspheres.

Item Type: Article
Subjects: Quantum Phenomena
Quantum Phenomena > Nanophysics
Last Modified: 02 Feb 2018 13:15
URI: http://eprintspublications.npl.co.uk/id/eprint/4823

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