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

TL;DR

This paper demonstrates a method to achieve significant photoluminescence enhancement in photonic crystal nanocavities through double resonance involving localized guided modes and cavity modes, with flexible wavelength control.

Contribution

It introduces a double resonance technique using localized guided modes in photonic crystals, enabling enhanced photoluminescence and nonlinear processes with flexible defect size control.

Findings

Photoluminescence enhancement exceeds three orders of magnitude.

Localized guided modes are insensitive to defect size for certain polarizations.

The technique can improve nonlinear wavelength conversion efficiencies.

Abstract

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