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


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.



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

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Correspondence to Yury P. Rakovich.

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  • Microcavity
  • Nanocrystals
  • Quantum dots
  • Raman spectroscopy
  • Anti-Stokes emission