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We observe the weak coupling of lead sulphide nanocrystals to localizeddefect modes of 2-dimensional silicon nanocavities. Cavity resonancescharacterized with ensemble nanocrystals are verified with cold-cavitymeasurements using integrated waveguides. Polarization dependence of the cavityfield modes is observed. The linewidths measured in coupling experiments arebroadened in comparison to the cold-cavity characterization, partly due tolarge homogeneous linewidths of the nanocrystals. The calculated Purcell factorfor a single exciton is 75, showing promise toward applications in singlephoton systems. These novel light sources operate near 1.55 micron wavelengthsat room temperature, permitting integration with current fiber communicationsnetworks.Comment: 11 pages, 4 figures, Content Modified from original manuscript with  additional measurements and simulation

Weak coupling interactions of colloidal lead sulphide nanocrystals with silicon photonic crystal nanocavities near 1.55μm at room temperature