Physics – Quantum Physics
Scientific paper
2004-12-11
Appl. Phys. Lett., Vol 86, 151106 (2005)
Physics
Quantum Physics
4 pages, 3 figures
Scientific paper
10.1063/1.1901810
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 (lambda~1400 nm) that is red-detuned from the dot emission wavelength (lambda~1200 nm). Measurements in the 1400 nm wavelength band on microdisks of diameter D = 4.5 microns show that these structures support modes with cold-cavity quality factors as high as 360,000. DWELL-containing microdisks are then studied through optical pumping at room temperature. Pulsed lasing at lambda ~ 1200 nm is seen for cavities containing a single layer of InAs dots, with threshold values of ~ 17 microWatts, approaching the estimated material transparency level. Room-temperature continuous wave operation is also observed.
Barclay Paul E.
Borselli Matthew
Johnson Thomas J.
Krishna Sanjay
Painter Oskar
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