Abstract
We numerically analyze the optical response and nonlinear susceptibilities of flshnet metamaterials with the holes inflltrated by a third-order nonlinear dielectric. Through full-wave simulations and employing a nonlinear parameter retrieval method, we conflrm and quantify the enhanced nonlinearities, showing bulk third-order nonlinear susceptibilities that are up to two orders of magnitude larger than the nonlinear dielectric. We also use the retrieved parameters to calculate the material flgure of merits and the conversion e-ciencies, showing material flgure of merits up to two orders of magnitude larger and conversion e-ciencies up to four orders of magnitude larger than the nonlinear dielectric alone. Though these results are calculated using one-unit-cell thick structures, the large magnitude of the enhancement still makes these structures attractive, allowing reasonable conversion e-ciencies supported by even subwavelength slabs.
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