Abstract
The authors observe the weak coupling of lead sulphide nanocrystals to localized defect modes of two-dimensional silicon nanocavities. Cavity resonances characterized with ensemble nanocrystals are verified with cold-cavity measurements using integrated waveguides. Polarization dependence of the cavity field modes is observed. The linewidths measured in coupling experiments are broadened in comparison to the cold-cavity characterization, partly due to large homogeneous linewidths of the nanocrystals. The calculated Purcell factor [Phys. Rev. 69, 681 (1946)] for a single exciton is 100, showing promise toward applications in single photon systems. These novel light sources operate near 1.55μm wavelengths at room temperature, permitting integration with current fiber communication networks.
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