Trapped mode resonances in symmetric rectangular-hole tetramers

Abstract High Q -factor trapped mode resonances are mostly supported by weakly asymmetric metamolecules. In this paper, we study theoretically and experimentally a planar all-metallic metamaterial comprising highly symmetric metamolecules (rectangular-hole tetramers in a freestanding metallic plate)...

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Bibliographic Details
Published inJournal of physics. D, Applied physics Vol. 55; no. 4; pp. 45302 - 45309
Main Authors Yin, Xiao-gang, Liu, You-wen, Huang, Cheng-ping
Format Journal Article
LanguageEnglish
Published IOP Publishing 27.01.2022
Subjects
electromagnetically induced transparency
high Q-factor
metamaterial
metasurface
slow wave effect
trapped mode
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Summary:Abstract High Q -factor trapped mode resonances are mostly supported by weakly asymmetric metamolecules. In this paper, we study theoretically and experimentally a planar all-metallic metamaterial comprising highly symmetric metamolecules (rectangular-hole tetramers in a freestanding metallic plate) and find that high Q -factor trapped mode resonances can also be realized. The effect comes from the destructive interference between two anti-phased excitations: the electric dipole modes of the two inner and two outer rectangular holes within individual tetramers. Here, the high Q -factor resonance is dominated by the hole separation that affects greatly the coupling and radiation. At the resonance, a huge enhancement of electric field in each hole appears, accompanied by a significant slow-wave effect in the reflection process. Our design has potential applications in constructing high Q -factor filters, highly sensitive sensors and slow-wave devices.
Bibliography:JPhysD-129025.R1
ISSN:0022-3727
1361-6463
DOI:10.1088/1361-6463/ac2e8d