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A recurring theme in optics and photonics is the ability of metal nanostructures to imbue artificial materials with new functions. Metallic nano-antennas [1], so-called meta-atoms, are the building blocks of such metamaterials that boast unusual linear [2, 3] and nonlinear [4– 6] characteristics not observed in natural materials. Recently, nonlinear metamaterials have generated considerable excitement;...
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