Evaluation of graphene optical nonlinearity with photon-pair generation in graphene-on-silicon waveguides
arXiv:2003.09256 · doi:10.1364/OE.27.030262
Abstract
We evaluate the nonlinear coefficient of graphene-on-silicon waveguides through the coincidence measurement of photon-pairs generated via spontaneous four-wave mixing. We observed the temporal correlation of the photon-pairs from the waveguides over various transfer layouts of graphene sheets. A simple analysis of the experimental results using coupled-wave equations revealed that the atomically-thin graphene sheets enhanced the nonlinearity of silicon waveguides up to ten-fold. The results indicate that the purely -based effective nonlinear refractive index of graphene is on the order of m/W, and provide important insights for applications of graphene-based nonlinear optics in on-chip nanophotonics.
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