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The spectra of two-dimensional photonic crystal slab nanocavities withembedded InAs quantum dots are measured by photoluminescence and reflectance.In comparing the spectra taken by these two different methods, consistency withthe nanocavities' resonant wavelengths is found. Furthermore, it is shown thatthe reflectance method can measure both active and passive cavities. Q-factorsof nanocavities, whose resonant wavelengths range from 1280 to 1620 nm, aremeasured by the reflectance method in cross polarization. Experimentally,Q-factors decrease for longer wavelengths and the intensity, reflected by thenanocavities on resonance, becomes minimal around 1370 nm. The trend of theQ-factors is explained by the change of the slab thickness relative to theresonant wavelength, showing a good agreement between theory and experiment.The trend of reflected intensity by the nanocavities on resonance can beunderstood as effects that originate from the PC slab and the underlying aircladding thickness. In addition to three dimensional finite-differencetime-domain calculations, an analytical model is introduced that is able toreproduce the wavelength dependence of the reflected intensity observed in theexperiment.

Reflectance measurement of two-dimensional photonic crystal nanocavities with embedded quantum dots