Multi-modal phase matching for stimulated and spontaneous four-wave mixing in silicon waveguides.

Signorini S., Mancinelli M., Trenti A., Bernard M. , Ghulinyan M., Pucker G., Pavesi L.

II - Fisica della materia
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Four-wave-mixing (FWM) is a nonlinear optical process in which two pump photons at wavelength $\lambda_{P}$ are converted into signal and idler photons at wavelengths $\lambda_{S}$ and $\lambda_{I}$, respectively. FWM efficiency is maximized when the phase matching condition is fulfilled. We demonstrate spontaneous and stimulated FWM in silicon waveguides with a novel approach to phase matching, based on the excitation of higher-order waveguide modes. With this approach we show controllable and large wavelength generation and conversion ($\lambda_{S} \lambda_{I} \simeq 790$ nm), that we exploit for the creation of an on-chip heralded single-photon source around 2 $\mu$m.

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