  We demonstrate the coupling of PbS quantum dot emission to photonic crystal
cavities at room temperature. The cavities are defined in 33% Al, AlGaAs
membranes on top of oxidized AlAs. Quantum dots were dissolved in
Poly-methyl-methacrylate (PMMA) and spun on top of the cavities. Quantum dot
emission is shown to map out the structure resonances, and may prove to be
viable sources for room temperature cavity coupled single photon generation for
quantum information processing applications. These results also indicate that
such commercially available quantum dots can be used for passive structure
characterization. The deposition technique is versatile and allows layers with
different dot densities and emission wavelengths to be re-deposited on the same
chip.
