Silicon metasurfaces with tunable electromagnetic resonances for nonlinear optical conversion

Fagiani, L. and Zilli, A. and Tognazzi, A. and Mafakheri, E. and Okhlopkov, K. (2021) Silicon metasurfaces with tunable electromagnetic resonances for nonlinear optical conversion. Il nuovo cimento C, 44 (4-5). pp. 1-4. ISSN 1826-9885

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Abstract

Dielectric metasurfaces sustain electromagnetic modes which can be exploited to enhance nonlinear frequency-conversion processes such as thirdharmonic 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.

Item Type:	Article
Subjects:	500 Scienze naturali e Matematica > 530 Fisica
Depositing User:	Marina Spanti
Date Deposited:	20 Sep 2021 09:50
Last Modified:	20 Sep 2021 09:50
URI:	http://eprints.bice.rm.cnr.it/id/eprint/21353

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