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.

Optical tuning of dielectric nanoantennas for thermo-optically reconfigurable nonlinear metasurfaces

Celebrano M.;Zilli A.;Rusconi F.;Mazzanti A.;Ghirardini L.;Pogna E. A. A.;Biagioni P.;Duo Lamberto;Cerullo G.;Della Valle G.;Finazzi M.;
2021-01-01

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.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11311/1175474
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