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Cavity Q, mode volume, and lasing threshold in small diameter AlGaAs microdisks with embedded quantum dots

Srinivasan, Kartik and Borselli, Matthew and Painter, Oskar and Stintz, Andrew and Krishna, Sanjay (2006) Cavity Q, mode volume, and lasing threshold in small diameter AlGaAs microdisks with embedded quantum dots. Optics Express, 14 (3). pp. 1094-1105. ISSN 1094-4087.

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The quality factor (Q), mode volume (Veff), and room-temperature lasing threshold of microdisk cavities with embedded quantum dots (QDs) are investigated. Finite element method simulations of standing wave modes within the microdisk reveal that Veff can be as small as 2(λ/n)^3 while maintaining radiation-limited Qs in excess of 10^5. Microdisks of diameter 2 µm are fabricated in an AlGaAs material containing a single layer of InAs QDs with peak emission at λ = 1317 nm. For devices with Veff ~2 (λ/n)^3, Qs as high as 1.2×10^5 are measured passively in the 1.4 µm band, using an optical fiber taper waveguide. Optical pumping yields laser emission in the 1.3 µm band, with room temperature, continuous-wave thresholds as low as 1 µW of absorbed pump power. Out-coupling of the laser emission is also shown to be significantly enhanced through the use of optical fiber tapers, with laser differential efficiency as high as ξ ~ 16% and out-coupling efficiency in excess of 28%.

Item Type:Article
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Painter, Oskar0000-0002-1581-9209
Additional Information:© 2006 Optical Society of America Original Manuscript: November 17, 2005; Revised Manusctipt: January 13, 2006; Manuscipt Accepted: January 24, 2006; Published: February 6, 2006 This work was partly supported by the Charles Lee Powell Foundation. The authors thank Christopher P. Michael, Paul E. Barclay, and Thomas J. Johnson for helpful discussions. KS thanks the Hertz Foundation and MB thanks the Moore Foundation, NPSC, and HRL Laboratories for their graduate fellowship support.
Funding AgencyGrant Number
Charles Lee Powell FoundationUNSPECIFIED
Fannie and John Hertz FoundationUNSPECIFIED
Gordon and Betty Moore FoundationUNSPECIFIED
National Physical Science ConsortiumUNSPECIFIED
Hughes Research LaboratoriesUNSPECIFIED
Subject Keywords:(140.5960) Lasers and laser optics : Semiconductor lasers; (230.5750) Optical devices : Resonators; (270.0270) Quantum optics : Quantum optics
Issue or Number:3
Record Number:CaltechAUTHORS:SRIoe06
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:1759
Deposited By: Archive Administrator
Deposited On:16 Feb 2006
Last Modified:02 Oct 2019 22:46

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