Optical tuning of dielectric nanoantennas for thermo-optically reconfigurable nonlinear metasurfaces
- Autori: Celebrano M.; Rocco D.; Gandolfi M.; Zilli A.; Rusconi F.; Tognazzi A.; Mazzanti A.; Ghirardini L.; Pogna E.A.A.; Carletti L.; Baratto C.; Marino G.; Gigli C.; Biagioni P.; Duo L.; Cerullo G.; Leo G.; Valle G.D.; Finazzi M.; de Angelis C.
- Anno di pubblicazione: 2021
- Tipologia: Articolo in rivista
- OA Link: http://hdl.handle.net/10447/547616
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.