Simplified Design of Quad-Band Terahertz Absorber Based on Periodic Closed-Ring Resonator
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Simplified Design of Quad-Band Terahertz Absorber Based on Periodic Closed-Ring Resonator Pengcheng Lou 1,2 & Ben-Xin Wang 1
&
Yuanhao He 1 & Chao Tang 1 & Qingshan Niu 1 & Fuwei Pi 2
Received: 26 December 2019 / Accepted: 5 May 2020 # Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Multiple-band metamaterial absorbers as an important branch of metamaterial-based resonant devices have shown considerable application prospects in real life. However, current designs have many shortcomings in the realization of multiple-band absorption, including complex pattern structure, time-consuming fabrication steps, and strong interaction between sub-elements. Herein, a simple design of multiple-band metamaterial absorber based on single metallic resonator is presented. Basic cell of the multiple-band absorption is formed by a square metallic patch (cut by a concentric air gap) placed on a metallic mirror separated by an insulating medium material. The metamaterial structure can interact strongly with the incident beam to produce the fundamental mode resonance, third-order resonance, and two other resonances resulted from the concentric air gap introduction. The combining effect of the four discrete resonance modes provides the ability to achieve quad-band absorption. The quad-band absorption shows great dependence on the structure dimensions. Based on this, we further design a kind of multipleband absorption having the adjustable number of absorption peaks by introducing photosensitive silicon material in the initial area of the air gap. The number of resonance peaks can be tuned flexibly from quad-band absorption to dual-band absorption by changing the conductivity (i.e., material property) of photosensitive silicon material. Keywords Terahertz metamaterial . Perfect absorber . Quad-band absorption . Closed-ring resonator
Introduction Metamaterial perfect light absorbers as one of the most exciting topics have attracted much attention because of its important uses [1]. Since the metamaterial perfect light absorbers were first demonstrated in 2008 [2], many types of metamaterial absorption devices have been suggested to meet different application requirements [3–6]. For example, single cross-shaped structure can be used to realize single-band absorption performance [7]. Dual-band/triple-band polarization insensitive metamaterial absorber was presented by using different-sized square metallic patches [8]. Many other shapes of structures, such as split-ring resonator [3], elliptical * Ben-Xin Wang [email protected] * Fuwei Pi [email protected] 1
School of Science, Jiangnan University, Wuxi 214122, China
2
State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi 214122, China
resonator [4], spiral resonator [5], and closed-ring resonator [6], have been suggested to meet different application requirements. Among these structures, closed-ring resonator has attracted special research interest due to its simple resonance structu
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