Abstract
We demonstrate that nonlinear dielectric nanorod chains enhance the second-harmonic generation by taking advantage of subwavelength light confinement. We report a conversion efficiency higher than 10% for only 200 W input pump peak power in a 20 nanorod chain possessing a nonlinear susceptibility chi(2) = 10 pm/V. This giant frequency conversion is shown to originate from a lateral squeezing of the fundamental guided mode and from the combination of slow light at both frequencies omega and 2 omega. These results open an interesting route for the design of highly integrated efficient nonlinear devices.
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