Abstract
We demonstrate up to 30 nm tuning of gallium phosphide photonic crystal cavities resonances at aproximately 1.5 microm using a tapered optical fiber. The tuning is achieved through a combination of near-field perturbations and mechanical deformation of the membrane, both induced by the fiber probe. By exploiting this effect, we show fiber-coupled second harmonic generation with a tuning range of nearly 10 nm at the second harmonic wavelength of approximately 750 nm. By scaling cavity parameters, the signal could easily be shifted into other parts of the visible spectrum.
Highlights
Nanophotonic cavities enhance light-matter interaction and have found many interesting uses in devices such as lasers [1], modulators [2], biosensors [3], as well as in fundamental experiments employing single quantum dots [4]
Fiber tapers were fabricated in the same way as in our earlier work [11], using a flame brushing procedure [14] in which a standard single mode communication fiber is simultaneously heated by a torch and pulled outward by motorized stages
We show that the ability to tune a resonance in a Photonic crystal (PC) cavity translates into a large tuning range for the second harmonic generated (SHG) in the cavity
Summary
Nanophotonic cavities enhance light-matter interaction and have found many interesting uses in devices such as lasers [1], modulators [2], biosensors [3], as well as in fundamental experiments employing single quantum dots [4]. Since nanofabrication techniques frequently produce cavities at wavelengths different than their intended designs, many attempts have been made to tune cavities post-processing Mechanisms of both reversible and irreversible tuning that have been developed include local temperature control by Ohmic heaters [6], chemical etching [7], near-field tip perturbation [8], photosensitive material illumination [9], carbon dot deposition [10], and fiber taper probing [11,12]. Fiber-induced deformation of the thin membranes increases the cavity resonance shift We use these effects to show that the second harmonic (generated by cavity enhanced process [13]) signal generated can be tuned by 10 nm, half the cavity tuning range
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