Rotating two C3v-symmetric plasmonic metasurfaces relative to each other tunes SHG phase-matching peaks continuously across 900-970 nm pump wavelengths via the nonlinear geometric phase, completing a full 2π cycle with 120° rotation.
Non- linear wavefront control by geometric-phase dielectric metasurfaces: influence of mode field and rotational symmetry
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Active control of phase matching in nonlinear metasurfaces using Pancharatnam--Berry phase
Rotating two C3v-symmetric plasmonic metasurfaces relative to each other tunes SHG phase-matching peaks continuously across 900-970 nm pump wavelengths via the nonlinear geometric phase, completing a full 2π cycle with 120° rotation.