Optical tuning of dielectric nanoantennas for thermo-optically reconfigurable nonlinear metasurfaces
Michele Celebrano, Davide Rocco, Marco Gandolfi, Attilio Zilli, Francesco Rusconi, Andrea Tognazzi, Andrea Mazzanti, Lavinia Ghirardini, Eva A. A. Pogna, Luca Carletti, C. Baratto, Giuseppe Marino, Carlo Gigli, Paolo Biagioni, Lamberto Duò, Giulio Cerullo, Giuseppe Leo, Giuseppe Della Valle, Marco Finazzi, Costantino De Angelis
Abstract
We demonstrate optically tunable control of second-harmonic generation in all-dielectric nanoantennas: by using a control beam that is absorbed by the nanoresonator, we thermo-optically change the refractive index of the radiating element to modulate the amplitude of the second-harmonic signal. For a moderate temperature increase of roughly 40 K, modulation of the efficiency up to 60% is demonstrated; this large tunability of the single meta-atom response paves the way to exciting avenues for reconfigurable homogeneous and heterogeneous metasurfaces.