Abstract
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.
Highlights
Photonic crystals allow high degrees of control over light through periodic modulation of the refractive index [1]
We investigate the use of guided modes bound to defects in photonic crystals for achieving double resonances
Such a double resonance is desirable for nonlinear wavelength-conversion processes such as sum and difference frequency generation, four-wave mixing, and Raman scattering
Summary
Photonic crystals allow high degrees of control over light through periodic modulation of the refractive index [1]. When the emitters are optically excited, further control can be achieved by tuning another mode in a cavity to the excitation wavelength to obtain a double resonance [10,11] Such a double resonance is desirable for nonlinear wavelength-conversion processes such as sum and difference frequency generation, four-wave mixing, and Raman scattering. Changing the defect structure does not cause significant shifts in the localized resonances for one of the polarizations, allowing for a simple design procedure to achieve double resonances for various wavelength combinations. We demonstrate such flexibility by tuning the double resonance in a wide range of excitation and emission wavelengths
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