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The spin angular momentum of light plays an important role in nonlinear interactions in optical systems with rotational symmetries. Here, the existence of the nonlinear geometric Berry phase is demonstrated in the four‐wave mixing process and applied to spin‐controlled nonlinear light generation from plasmonic metasurfaces. The polarization state of four‐wave mixing from the ultrathin metasurfaces,...
3D chirality is shown to be unnecessary for introducing strong circular dichroism for harmonic generations. Specifically, near‐unity circular dichroism for both second‐harmonic generation and third‐harmonic generations is demonstrated on suitably designed ultrathin plasmonic metasurfaces with only 2D planar chirality. The study opens up new routes for designing chip‐type biosensing platform, which...
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