Open Access

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. Rakovich2Email author,
  • Matthias Gerlach2,
  • John F. Donegan2,
  • Diana Savateeva3 and
  • Andrey L. Rogach4
Nanoscale Research Letters20061:68

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

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Declarations

Acknowledgments

This work was supported by Science Foundation Ireland (SFI) under grant number 02/IN.1/I47. ALR acknowledges the Walton Award from the SFI.

Authors’ Affiliations

(1)
Physical Chemistry/Electrochemistry, TU Dresden
(2)
Semiconductor Photonics Group, School of Physics, Trinity College
(3)
Brest State Technical University
(4)
Department of Physics and CeNS, University of Munich

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Copyright

© to the authors 2006