Micro-photoluminescence of GaAs/AlGaAs triple concentric quantum rings
1 L.E.N.S. and Dipartimento di Fisica, Universitá di Firenze, Via Sansone 1, I-50019, Sesto Fiorentino, Italy
2 L-NESS and Dipartimento di Scienza dei Materiali, Universitá di Milano Bicocca, Via Cozzi 53, I-20125, Milano, Italy
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.