Gap-Size-Dependent Effective Phase Transition in Metasurfaces of Closed-Ring Resonators
Open Access
Abstract
We theoretically investigate a metal-to-insulator transition in artificial two-dimensional (2D) crystals (i.e., metasurfaces) of tightly coupled closed-ring resonators. Strong interaction between unit resonators in the metasurfaces yields the effective permittivity highly dependent on the lattice spacing of unit resonators. Through our rigorous theory, we provide a closed form of effective permittivity of the metasurface and reveal that the permittivity possesses a Lorentzian-type resonant behavior, implying that the transition of the effective permittivity can arise when the lattice spacing passes a critical value.Keywords
Funding Information
- National Research Foundation of Korea (NRF-2021R1A2C2012617, NRF-2020R1F1A1076886, NRF-2020R1C1C1012138)
- Kongju National University (2020)
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