Weak exciton-photon coupling of PbS nanocrystals in air-slot mode-gap Si photonic crystal nanocavities in the near-infrared

We demonstrate micro-photoluminescence measurements of PbS nanocrystals coupled to air-slot mode-gap photonic crystal nanocavities with Q~15,000 and Veff ~0.02 (λ/nair)3. The ultrahigh Q/V ratios are critical for applications in cavity QED, nonlinear optics and sensing. © 2010 Optical Society of America.