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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 22 — Nov. 4, 2013
  • pp: 25985–25998

Carrier saturation in multiple quantum well metallo-dielectric semiconductor nanolaser: Is bulk material a better choice for gain media?

Felipe Vallini, Qing Gu, Michael Kats, Yeshaiahu Fainman, and Newton C. Frateschi  »View Author Affiliations


Optics Express, Vol. 21, Issue 22, pp. 25985-25998 (2013)
http://dx.doi.org/10.1364/OE.21.025985


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Abstract

Although multi quantum well (MQW) structure is frequently suggested as the appropriate medium for providing optical gain in nanolasers with low threshold current, we demonstrate that in general bulk gain medium can be a better choice. We show that the high threshold gain required for nanolasers demands high threshold carrier concentrations and therefore a highly degenerate condition in which the barriers between the quantum wells are heavily pumped. As a result, there occurs spontaneous emission from the barrier in very dissipative low Q modes or undesired confined higher Q modes with resonance wavelengths close to the barrier bandgap. This results in a competition between wells and barriers that suppresses lasing. A complete model involving the optical properties of the resonant cavity combined with the carrier injection in the multilayer structure is presented to support our argument. With this theoretical model we show that while lasing is achieved in the nanolaser with bulk gain media, the nanolaser with MQW gain structure exhibits well emission saturation due to the onset of barrier emission.

© 2013 Optical Society of America

OCIS Codes
(140.5960) Lasers and laser optics : Semiconductor lasers
(140.3948) Lasers and laser optics : Microcavity devices

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: August 29, 2013
Revised Manuscript: October 1, 2013
Manuscript Accepted: October 12, 2013
Published: October 23, 2013

Citation
Felipe Vallini, Qing Gu, Michael Kats, Yeshaiahu Fainman, and Newton C. Frateschi, "Carrier saturation in multiple quantum well metallo-dielectric semiconductor nanolaser: Is bulk material a better choice for gain media?," Opt. Express 21, 25985-25998 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-22-25985


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