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We use an optical fiber taper waveguide to probe PbS quantum dots (QDs) driedon Si photonic crystal cavities near 1.55 $\mu$m. We demonstrate that a lowdensity ($\lesssim 100 \mu$m$^{-2}$) of QDs does not significantly degradecavity quality factors as high as $\approx3\times10^4$. We also show that thetapered fiber can be used to excite the QDs and collect the subsequentcavity-filtered photoluminescence, and present measurements of reversiblephotodarkening and QD saturation. This method represents an important steptowards spectroscopy of single colloidal QDs in the telecommunications band.

Spectroscopy of 1.55 $\mu$m PbS Quantum Dots on Si Photonic Crystal Cavities with a Fiber Taper Waveguide