Silicon metasurfaces with tunable electromagnetic resonances for nonlinear optical conversion
- Autori: Fagiani L.; Zilli A.; Tognazzi A.; Mafakheri E.; Okhlopkov K.; Rocco D.; Shcherbakov M.; Fedyanin A.; de Angelis C.; Finazzi M.; Celebrano M.; Bollani M.
- Anno di pubblicazione: 2021
- Tipologia: Contributo in atti di convegno pubblicato in rivista
- OA Link: http://hdl.handle.net/10447/547686
Abstract
Dielectric metasurfaces sustain electromagnetic modes which can be exploited to enhance nonlinear frequency-conversion processes such as third-harmonic generation. In this work we employ electron-beam lithography to fabricate silicon metasurfaces supporting electromagnetic resonances with different quality factors (Q), ruled by the geometry. This allows to investigate the trade-off between resonant enhancement and matching the spectral bandwidth of the ultrafast excitation source. Both experiments and simulations indicate that higher values of Q do not a priori bring about a stronger third-harmonic generation, which correlates to the spectral overlap between the metasurface resonance and the pump bandwidth.