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Optical loss and lasing characteristics of high-quality-factor AlGaAs microdisk resonators with embedded quantum dots

Srinivasan, Kartik and Borselli, Matthew and Johnson, Thomas J. and Barclay, Paul E. and Painter, Oskar and Stintz, Andreas and Krishna, Sanjay (2005) Optical loss and lasing characteristics of high-quality-factor AlGaAs microdisk resonators with embedded quantum dots. Applied Physics Letters, 86 (15). Art. No. 151106. ISSN 0003-6951. http://resolver.caltech.edu/CaltechAUTHORS:SRIapl05

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Abstract

Optical characterization of AlGaAs microdisk resonant cavities with a quantum dot active region is presented. Direct passive measurement of the optical loss within AlGaAs microdisk resonant structures embedded with InAs/InGaAs dots-in-a-well (DWELL) is performed using an optical-fiber-based probing technique at a wavelength (λ ~ 1.4 μm) that is red detuned from the dot emission wavelength (λ ~ 1.2 μm). Measurements in the 1.4 μm wavelength band on microdisks of diameter D=4.5 μm show that these structures support modes with cold-cavity quality factors as high as 3.6 x 10^(5). DWELL-containing microdisks are then studied through optical pumping at room temperature. Pulsed lasing at λ ~ 1.2 μm is seen for cavities containing a single layer of InAs dots, with threshold values of ~ 17 μW, approaching the estimated material transparency level. Room-temperature continuous-wave operation is also observed.


Item Type:Article
Additional Information:Copyright © 2005 American Institute of Physics. Received 16 December 2004; accepted 28 February 2005; published online 6 April 2005. One of the authors (K.S.) thanks K. Hennessy for helpful conversations regarding AlGaAs processing. Three of the authors (K.S., T.J., and M.B.), respectively, thank the Hertz Foundation, the Charles Lee Powell Foundation, and the Moore Foundation, NPSC, and HRL Laboratories for their graduate fellowship support.
Subject Keywords:aluminium compounds; indium compounds; gallium arsenide; III-V semiconductors; semiconductor quantum dots; semiconductor quantum wells; laser cavity resonators; quantum dot lasers; microdisc lasers; microcavities; Q-factor; optical losses; photoluminescence; optical pumping
Record Number:CaltechAUTHORS:SRIapl05
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:SRIapl05
Alternative URL:http://dx.doi.org/10.1063/1.1901810
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:2277
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:21 Mar 2006
Last Modified:26 Dec 2012 08:48

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