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Open Access Nano Express

Whispering gallery modes in photoluminescence and Raman spectra of a spherical microcavity with CdTe quantum dots: anti-Stokes emission and interference effects

Nikolai Gaponik1, Yury P Rakovich2*, Matthias Gerlach2, John F Donegan2, Diana Savateeva3 and Andrey L Rogach4

Author Affiliations

1 Physical Chemistry/Electrochemistry, TU Dresden, 01062, Dresden, Germany

2 Semiconductor Photonics Group, School of Physics, Trinity College, Dublin 2, Ireland

3 Brest State Technical University, 224017, Brest, Belarus

4 Department of Physics and CeNS, University of Munich, 80799, Munich, Germany

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Nanoscale Research Letters 2006, 1:68-73  doi:10.1007/s11671-006-9005-9

Published: 25 July 2006

Abstract

We have studied the photoluminescence and Raman spectra of a system consisting of a polystyrene latex microsphere coated by CdTe colloidal quantum dots. The cavity-induced enhancement of the Raman scattering allows the observation of Raman spectra from only a monolayer of CdTe quantum dots. Periodic structure with very narrow peaks in the photoluminescence spectra of a single microsphere was detected both in the Stokes and anti-Stokes spectral regions, arising from the coupling between the emission of quantum dots and spherical cavity modes.

Keywords:
Microcavity; Nanocrystals; Quantum dots; Raman spectroscopy; Anti-Stokes emission