Micro-photoluminescence of GaAs/AlGaAs triple concentric quantum rings
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Nanoscale Research Letters 2011, 6:569 doi:10.1186/1556-276X-6-569Published: 31 October 2011
A systematic optical study, including micro, ensemble and time resolved photoluminescence of GaAs/AlGaAs triple concentric quantum rings, self-assembled via droplet epitaxy, is presented. Clear emission from localized states belonging to the ring structures is reported. The triple rings show a fast decay dynamics, around 40 ps, which is expected to be useful for ultrafast optical switching applications.