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Dielectric metasurfaces provide a unique platform for efficient harmonic generation and optical wavefront manipulation at the nanoscale. While several approaches are available for performing wavefront shaping, the one exploiting geometric phase streamlines significantly the design and fabrication process. It has been recently shown that, in III–V semiconductor alloys, the rotation of the crystal axes affects the phase and amplitude of second-harmonic generation induced by circularly polarized light (Carletti et al. Nanophotonics 2024, 13 (18), 3321–3326). Based on this notion, we designed, fabricated, and characterized two aluminum gallium arsenide metasurfaces displaying the versatility of the geometric phase approach through nonlinear beam steering and structured-light generation on the harmonic field.
Guercio et al. (Fri,) studied this question.