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: Sapienza Univ Roma, Dipartimento Ingn Informaz Elettron & Telecomunic, Via Eudossiana 18, I-00184 Rome, Italy; Univ Palermo, Dipartimento Ingn, Viale Sci 8, I-90128 Palermo, Italy; CNR, Ist Nazl Ott, INO, CNR, Via Branze 45, I-25123 Brescia, Italy; Univ Brescia, Dipartimento Ingn Informaz, Via Branze 38, I-25123 Brescia, Italy; Consorzio Nazl Interuniv Telecomunicaz CNIT, Viale GP Usberti 181-A Sede Sci Ingn Palazzina 3, I-43124 Parma, Italy; Lab Europeo Spettroscopia Nonlineare Lens, Via Nello Carrara 1, I-50019 Sesto Fiorentino, Italy; Ist Nazl Ric Metrol INRiM, Str Cacce 91, I-10135 Turin, 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 dellŽIstruzione, dellŽUniversita 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

Citations: 8
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