TITLE

Subwavelength multichannel imaging using a solid immersion lens: Spectroscopy of excitons in single quantum dots

AUTHOR(S)
Hewaparakrama, K. P.; Wilson, A.; Mackowski, S.; Jackson, H. E.; Smith, L. M.; Karczewski, G.; Kossut, J.
PUB. DATE
November 2004
SOURCE
Applied Physics Letters;11/29/2004, Vol. 85 Issue 22, p5463
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We demonstrate subwavelength 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=0 T, we find that the distribution of the exchange splitting is centered at zero with a standard deviation of ±340 μeV. Similar experiments performed at B=3 T give an average value of the exciton effective g factor of 3.1±0.4. This experimental approach provides an effective means to gain statistical information about the quantum-dot exciton fine structure in the ensemble.
ACCESSION #
15244084

 

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