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Comparison Between the Linear and Nonlinear Homogenization of Graphene and Silicon Metasurfaces

Ren, Q; You, JW; Panoiu, N-C; (2020) Comparison Between the Linear and Nonlinear Homogenization of Graphene and Silicon Metasurfaces. IEEE Access , 8 pp. 175753-175764. 10.1109/access.2020.3026313. Green open access

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Abstract

In this article, we use a versatile homogenization approach to model the linear and nonlinear optical response of two metasurfaces: a plasmonic metasurface consisting of graphene patches and a dielectric photonic nanostructure consisting of silicon photonic crystal (PhC) cavities. The former metasurface is resonant at wavelengths that are much larger than the graphene elements of the metasurface, whereas the resonance wavelengths of the latter one are comparable to the size of its resonant components. By computing and comparing the effective permittivities and nonlinear susceptibilities of the two metasurfaces, we infer some general principles regarding the conditions under which homogenization methods of metallic and dielectric metasurfaces are valid. In particular, we show that in the case of the graphene metasurface the homogenization method describes very well both its linear and nonlinear optical properties, whereas in the case of the silicon photonic nanostructure the homogenization method is only qualitatively accurate, especially near the optical resonances.

Type: Article
Title: Comparison Between the Linear and Nonlinear Homogenization of Graphene and Silicon Metasurfaces
Open access status: An open access version is available from UCL Discovery
DOI: 10.1109/access.2020.3026313
Publisher version: https://doi.org/10.1109/ACCESS.2020.3026313
Language: English
Additional information: © 2020 IEEE. This work is licensed under a Creative Commons Attribution 4.0 License (https://creativecommons.org/licenses/by/4.0/).
Keywords: Computational electromagnetics, electromagnetic metasurfaces, nanophotonics, nonlinear plasmonics, terahertz generation
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/10111353
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