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We report elliptically-polarized fluorescence from colloidal semiconductor quantum dots in a chiral 1-D photonic bandgap microcavity composed of a planar-aligned cholesteric liquid crystal. Antibunched fluorescence proves a polarized single photon source operating at room temperature.
The effect of dispersion of the excitation pulse in two-photon microscopy is examined with a photon-counting microscope in both stationary and scanning modalities, and it is demonstrated that transform-limited pulses provide the best signal yield despite increased bleaching rates.
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