Enhanced second-harmonic generation from magnetic resonance in AlGaAs nanoantennas
Luca Carletti, Andrea Locatelli, Oleksandr Stepanenko, Giuseppe Leo, Costantino De Angelis
University of Brescia Centre National de la Recherche Scientifique Sorbonne Paris Cité Laboratoire Matériaux et Phénomènes Quantiques
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We designed AlGaAs-on-aluminium-oxide all-dielectric nanoantennas with magnetic dipole resonance at near-infrared wavelengths. These devices, shaped as cylinders of 400nm height and different radii, offer a few crucial advantages with respect to the silicon-on-insulator platform for operation around 1.55μm wavelength: absence of two-photon absorption, high χ((2)) nonlinearity, and the perspective of a monolithic integration with a laser. We analyzed volume χ((2)) nonlinear effects associated to a magnetic dipole resonance in these nanoantennas, and we predict second-harmonic generation exceeding 10(-3) efficiency with 1GW/cm(2) of pump intensity.
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