Triple-Band Terahertz Perfect Light Absorber Using the Strong Interaction of Two Metallic Resonators
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https://doi.org/10.1007/s11664-020-08337-x Ó 2020 The Minerals, Metals & Materials Society
Triple-Band Terahertz Perfect Light Absorber Using the Strong Interaction of Two Metallic Resonators BEN-XIN WANG ,1,4 CHAO TANG,1 QINGSHAN NIU,1 YUANHAO HE,1 FUWEI PI,2 and XIAOYI WANG3,5 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. 3.—Key Laboratory of Optical System Advanced Manufacturing Technology, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China. 4.—e-mail: [email protected]. 5.—e-mail: [email protected]
An approach to realize a multiple-band perfect light absorber is demonstrated using a simple metamaterial design featuring a composite metallic structure consisting of a closed ring and a rectangular patch atop a metallic substrate separated by an insulator. Three narrow-band and discrete resonance peaks with nearly 100% absorption rates are obtained. The first absorption peak is due to the dipole resonance of the closed ring, while the last two absorption peaks are caused by the coupling effect of the closed ring and rectangular patch. The field distribution of the three absorption peaks is given to provide additional evidence. Unlike traditional multiple-band light absorbers that eliminate (or avoid) the interaction between the metallic array structures, our design is based on the mode coupling of the composite structure. This method can obviously reduce the number of metallic resonators, simplify the structure design and reduce fabrication costs. Key words: Terahertz metamaterial, perfect absorber, triple-band absorption, strong coupling
INTRODUCTION Over the past few years, studies on metamaterials have attracted wide interest from a vast number of researchers owing to their remarkable and exotic properties that cannot be directly obtained in natural materials. These properties include a negative refractive index,1 electromagnetic stealth and cloaking,2 and a perfect lens.3 However, these demonstrations on metamaterials are mainly focused on the acquisition of novel and exotic physical properties, and are not linked to the functional device designs. It has been reported that metamaterials have enormous potential applications and business opportunities in functional devices. This is why we have witnessed the
(Received October 22, 2019; accepted July 16, 2020)
explosive development of functional devices based on metamaterials in recent years.4–9 Metamaterial perfect light absorbers,9 as a typical representative of functional devices, have become the latest research hotspot because of their strong absorption capacity and ultra-thin insulator thickness. The design scheme of the perfect light absorber consisting of two metallic pattern structures separated by an insulator was firstly demonstrated by researchers from Boston College in 2008.9 A single resonance absorption peak with the absor
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