Trapped-mode resonances in all-metallic metasurfaces comprising rectangular-hole dimers with broken symmetry

• DOI: 10.1063/1.5128520
• Publication Date: 2019-12-02T12:31:17Z
• Authors: Jing-chun Yan; Zhi-kai Li; Yong Zhang; Yu-lin Wang; Cheng-ping Huang
• Keywords: Fano resonance; Q factor

Traditional metamaterial systems usually own a low Q factor due to the strong absorption and radiation loss. Fano resonances in ultrathin metasurfaces provide an efficient method for solving issue. In this work, we theoretically experimentally study trapped-mode resonance rectangular-hole dimers with broken symmetry. Compared asymmetric particle that have been widely investigated, hole freestanding metal screens present all-metallic platform engineering high-Q resonances. With experiments, significantly increased of ∼200 has achieved microwave region. Numerical simulations show that, comparison incident field, electric field (and intensity) can be by ∼127 times ∼16 000 times). Moreover, evolution characteristic structural parameters studied systematically. The inversely quadratic relationship between parameter, proposed primarily [Koshelev et al., Phys. Rev. Lett. 121, 193903 (2018)], is found work well dimers.