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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 21 — Oct. 11, 2010
  • pp: 22578–22592

Splitting and lasing of whispering gallery modes in quantum dot micropillars

B. D. Jones, M. Oxborrow, V. N. Astratov, M. Hopkinson, A. Tahraoui, M. S. Skolnick, and A. M. Fox  »View Author Affiliations

Optics Express, Vol. 18, Issue 21, pp. 22578-22592 (2010)

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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 50 μm. Multimode lasing with sub-milliwatt thresholds and high beta-factors approaching unity is observed under optical pumping in a 4 μm diameter pillar. Mode splitting is observed in WGMs from pillars with diameters of 5 μm, 20 μm and 50 μm. 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.

© 2010 Optical Society of America

OCIS Codes
(140.4780) Lasers and laser optics : Optical resonators
(240.6690) Optics at surfaces : Surface waves
(270.5580) Quantum optics : Quantum electrodynamics
(140.3945) Lasers and laser optics : Microcavities
(250.5960) Optoelectronics : Semiconductor lasers
(250.5590) Optoelectronics : Quantum-well, -wire and -dot devices

ToC Category:

Original Manuscript: July 30, 2010
Revised Manuscript: October 1, 2010
Manuscript Accepted: October 4, 2010
Published: October 8, 2010

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

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