Sub-Wavelength Multi-Channel Imaging Using a Solid Immersion Lens:   Spectroscopy of Excitons in Single Quantum Dots
  We demonstrate sub-wavelength imaging of excitons confined to single CdTe quantum dots. By combining slit-confocal microscopy with a hemispherical solid immersion lens we simultaneously map the emission of thousands of single quantum dots with a spatial resolution of 400 nm. By analyzing the linear polarization of the quantum dot emissions at B=0T, we find that the distribution of the exchange splitting is centered at zero with a standard deviation of 0.34 meV. Similar experiments performed at B=3T give an average value of the exciton effective g factor of 3.1. This experimental approach provides an effective means to gain statistical information about the quantum dot exciton fine structure in the ensemble. 
K. P. Hewaparakrama, S. Mackowski, H. E. Jackson, L. M. Smith, G.   Karczewski, J. Kossut