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Cavity Enhancement of Single Quantum Dot Emission in the Blue

Robert A Taylor1*, Anas F Jarjour1, Daniel P Collins1, Mark J Holmes1, Rachel A Oliver2, Menno J Kappers2 and Colin J Humphreys2

Author Affiliations

1 Clarendon Laboratory, Department of Physics, University of Oxford, Parks Road, Oxford, OX1 3PU, UK

2 Department of Materials Science and Metallurgy, University of Cambridge, Pembroke Street, Cambridge, CB2 3QZ, UK

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Nanoscale Research Letters 2009, 5:608-612  doi:10.1007/s11671-009-9514-4

Published: 27 December 2009


Cavity-enhanced single-photon emission in the blue spectral region was measured from single InGaN/GaN quantum dots. The low-Q microcavities used were characterized using micro-reflectance spectroscopy where the source was the enhanced blue output from a photonic crystal fibre. Micro-photoluminescence was observed from several cavities and found to be ~10 times stronger than typical InGaN quantum dot emission without a cavity. The measurements were performed using non-linear excitation spectroscopy in order to suppress the background emission from the underlying wetting layer.

InGaN; Quantum dot; Single-photon source; Microcavity