Finite-Size and Illumination Conditions Effects in All-Dielectric Metasurfaces

Year: 2022

Authors: Ciarella L., Tognazzi A., Mangini F., De Angelis C., Pattelli L., Frezza F.

Autors Affiliation: Dipartimento di Ingegneria dell´Informazione, Elettronica e Telecomunicazioni, Sapienza Universita di Roma, Via Eudossiana 18, Roma, 00184, Italy; Dipartimento di Ingegneria, Universita degli Studi di Palermo, Viale delle Scienze ed. 8, Palermo, 90128, Italy; Istituto Nazionale di Ottica-Consiglio Nazionale delle Ricerche (INO-CNR), Via Branze 45, Brescia, 25123, Italy; Dipartimento di Ingegneria dell?Informazione, Universita degli Studi di Brescia, Via Branze 38, Brescia, 25123, Italy; Consorzio Nazionale Interuniversitario per le Telecomunicazioni (CNIT), Viale G.P. Usberti 181/A Sede Scientifica di Ingegneria-Palazzina 3, Parma, 43124, Italy; Laboratorio Europeo di Spettroscopia Nonlineare (LENS), Via Nello Carrara 1, Sesto Fiorentino, 50019, Italy; Istituto Nazionale di Ricerca Metrologica (INRiM), Strada delle Cacce 91, Torino, 10135, Italy

Abstract: Dielectric metasurfaces have emerged as a promising alternative to their plasmonic counterparts due to lower ohmic losses, which hinder sensing applications and nonlinear frequency conversion, and their larger flexibility to shape the emission pattern in the visible regime. To date, the computational cost of full-wave numerical simulations has forced the exploitation of the Floquet theorem, which implies infinitely periodic structures, in designing such devices. In this work, we show the potential pitfalls of this approach when considering finite-size metasurfaces and beam-like illumination conditions, in contrast to the typical infinite plane-wave illumination compatible with the Floquet theorem.

Journal/Review: ELECTRONICS

Volume: 11 (7)      Pages from: 1017-1  to: 1017-11

More Information: This research was funded by Ministero dell´Istruzione, dell´Universita e della Ricerca through the PRIN project “NOMEN” (project 2017MP7F8F), the European community through the “METAFAST” project (H2020-FETOPEN-2018-2020, grant agreement no. 899673), and NATO through the Science for Peace and Security (SPS) Programme, project “OPTIMIST” (SPS G5850). L.P. acknowledges Progetto Premiale MIUR “Volume photography” and NVIDIA Corporation for the donation of the Titan X Pascal GPU used for this research.
KeyWords: all-dielectric metasurfaces; multipolar decomposition; T-matrix; BIC
DOI: 10.3390/electronics11071017