Year: 2025
Type: article
Abstract: Metasurfaces composed by arrays of coupled plasmonic resonators have attracted tremendous attention due to their extraordinary abilities to manipulate electromagnetic (EM) waves. However, existing theories for such systems are either empirical with model parameters obtained by fitting with simulations, or can only be applied to high‐frequency systems where metals exhibit finite permittivity. Here, we extend our recently established leaky‐eigenmode (LEM) theory to the microwave regime where metals exhibit infinite permittivity, with all parameters directly computable without fitting procedures. After validating our theory with both simulations and experiments on a benchmark metasurface, we illustrate how to utilize the theory to guide designing microwave metasurfaces with freely tailored line‐shapes, including particularly the generation of a bound state in the continuum. All theoretical predictions are verified by experiments and simulations. Our study provides a powerful tool to guide designing functional microwave meta‐devices for various applications.
Source: Nanophotonics
Authors: Yixiang Xu, Yufei Song, Han Zhu, Yifei Wang, Qiong He, Zhuo Wang, Lei Zhou
Institutions: Fudan University, State Key Laboratory of Surface Physics
Language: English
Field: Materials Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,995
OpenAlex ID: W4411371273