Whispering gallery modes in photoluminescence and Raman spectra of a spherical microcavity with CdTe quantum dots: anti-Stokes emission and interference effects
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
Nanoscale Research Letters 2006, 1:68-73 doi:10.1007/s11671-006-9005-9Published: 25 July 2006
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.