Tensor-Driven Geometric Phase in Nonlinear AlGaAs Metasurfaces
Year: 2026
Authors: Guercio G., Gerini A., Frizyuk K., Morassi M., Lemaitre A., De Angelis C., Carletti L., Leo G.
Autors Affiliation: Univ Paris Cite, Mat & Phenomenes Quant, F-75013 Paris, France; CNRS, F-75013 Paris, France; Karlsruhe Inst Technol, D-76131 Karlsruhe, Germany; Univ Paris Saclay, Ctr Nanosci & Nanotechnol, F-91120 Palaiseau, France; CNRS, F-91120 Palaiseau, France; Univ Brescia, Dept Informat Engn, I-25123 Brescia, Italy; INO CNR, I-25123 Brescia, Italy; Inst Univ France, F-75005 Paris, France.
Abstract: 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.
Journal/Review: ACS PHOTONICS
More Information: K.F. gratefully acknowledges support from the Alexander von Humboldt Foundation. L.C. acknowledges partial financial support from the European Union’s under Next Generation EU-PNRR-M4C2, investimento 1.1-PRIN 2022-NoLi-miTHz (id: 2022BC5BW5) CUP D53D23001140001. G.L. acknowledges ANR-DFG funding (Projet ANR-22-CE92-0090 MEGAPHONE).KeyWords: AlGaAs; metasurfaces; geometric phase; second-harmonic generationDOI: 10.1021/acsphotonics.6c00299
