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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,...
Recently, the concept of the geometric Pancharatnam-Berry (P-B) phase has been successfully extended to optical metasurfaces operating in the nonlinear regime1–3. It was shown that the nonlinear geometric P-B phase of each meta-atom is determined by the spin of the fundamental wave, the spin of the nonlinear signal, and the order of the nonlinear process1. By manipulating the interferences of SHG...
Based on the concept of spin rotation coupling, we propose and realize a novel nonlinear metasurface with homogeneous linear optical properties but continuously controllable phase of the local effective nonlinear polarizability. The continuous phase control over the nonlinearity is experimentally demonstrated for second and third harmonic generations by using nonlinear metasurfaces consisting of nanoantennas...
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...
Second-harmonic generation without the need for phase matching from a nanopatterned isotropic nonlinear material located inside the subwavelength gaps of a metallic coaxial array is reported. Numerical simulations are in good agreement with experimental data.
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