Broadband emission and low absorption in microdisks with AlGaAs quantum wells

Kipp, T.; Petter, K.; Heyn, Ch.; Heitmann, D.; Schüller, C.
March 2004
Applied Physics Letters;3/1/2004, Vol. 84 Issue 9, p1477
Academic Journal
In microphotoluminescence measurements at room temperature on Al[sub 0.2]Ga[sub 0.8]As/Al[sub 0.4]Ga[sub 0.6]As multiple quantum well microdisks, we observe a large number of whispering gallery modes in a remarkably broad energy range of about 250 meV. This is in contrast to microdisks containing InGaAs or GaAs quantum wells, where typically only one or two whispering gallery modes are observed, but similar to the behavior of microdisks containing self-organized InAs quantum dots. We conclude that impurity levels below the recombination energy of free electron-hole pairs inside the alloy quantum wells lead to an efficient internal broadband emitter with low absorption. © 2004 American Institute of Physics.


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