Localized Guided-Mode and Cavity-Mode Double Resonance in Photonic Crystal Nanocavities

Improving photoluminescence or nonlinear wavelength conversion is an important goal in engineering a wide variety of systems in optics, photonics, and nanoscience. To this end, it is challenging to design doubly resonant nanocavities that match a specific pair of wavelengths, as cavity modes are usually not independently tunable. The authors demonstrate flexible tuning of double resonances, and utilize guided-mode resonances localized at defects in photonic crystals to increase photoluminescence intensity by a factor of 2400.