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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...
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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