Localized guided-mode and cavity-mode double resonance in photonic crystal nanocavities

摘要

We investigate the use of guided modes bound to defects in photonic crystalsfor achieving double resonances. Photoluminescence enhancement by more thanthree orders of magnitude has been observed when the excitation and emissionwavelengths are simultaneously in resonance with the localized guided mode andcavity mode, respectively. We find that the localized guided modes arerelatively insensitive to the size of the defect for one of the polarizations,allowing for flexible control over the wavelength combinations. This doubleresonance technique is expected to enable enhancement of photoluminescence andnonlinear wavelength conversion efficiencies in a wide variety of systems.