Abstract
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.
Highlights
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
Droplet epitaxy [10,11] is a flexible growth method, based on Molecular Beam Epitaxy (MBE), which allows for the fabrication of a large variety of three dimensional nanostructures with different geometries, such as quantum dots [12], quantum dot molecules [13], quantum rings [8,14] and coupled disk-ring structures [15]
We have recently reported the possibility to fabricate multiple concentric quantum ring structures [9]
Summary
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. We present the detailed micro and time resolved photoluminescence characterization of the optical and electronic properties of one of such DE quantum nanostructures, made by three concentric quantum ring (TCQR).
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