A Newfangled Terahertz Absorber Tuned Temper by Temperature Field Doped by the Liquid Metal
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A Newfangled Terahertz Absorber Tuned Temper by Temperature Field Doped by the Liquid Metal Zi-Long Wang 1 & Cai-Xing Hu 1 & Hou-Bing Liu 1 & Hai-Feng Zhang 1,2 Received: 5 April 2020 / Accepted: 25 September 2020 # Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract In this article, a terahertz absorber tuned by temperature field with a newfangled structure is presented, which comprises the mercury resonators. In this scheme, temperature (T) build-up will lead the mercury stored in the bottom slot to expand through the columniform hole and be full of the upper central cross container, which can transform the absorption bands of such an absorber. The simulated results manifest that when T is increased from 0 to 25 °C, the dual-frequency absorption points (2.59 THz, 3.03 THz) and a narrow absorption region over 90% (6.54–7.10 THz), whose relative bandwidth (RB) is 7.9%, will be tailored to a single-frequency point absorption (3.12 THz) and a broadband absorption area (6.00–7.21 THz, and RB = 18.3%). For figuring out the property of the absorber mentioned above, the impacts of incident and polarization angles along with some relevant parameters of the structure on the absorption property are investigated. In addition, for plainly expounding the physical mechanism of absorption, the distributions of the surface current diagrams of the presented absorber are calculated, as well as the electric field diagrams, the magnetic field diagrams, the power loss density diagrams, and the power flow density diagrams. The proffered scheme in this article may offer a novel idea for realizing the reconfigurable absorbers. Keywords Reconfigurable absorber . Broadband absorber . Temperature field . Thermal expansion character . Liquid metal
Introduction Metamaterials, the artificial structures with unique properties, can satisfy the demands of multifarious adhibition like the metamaterial sensors [1, 2], antennas [3–5], and polarization converters [6–10] avoiding the restrictions of the natural materials. In 2008, as Landy and her mates [11] put forward the first metamaterial absorber, the classic metal-dielectric-metal structure become popular in the structural design of the absorbers. However, the researches on different absorber structures have never stopped. In 2016, Tharwat et al. adopted a new type of multistory structure that three functional layers were sandwiched between a glass substrate and a sensing medium [12]. In 2017, Ling et al. altered the design pattern of conventional three-dimensional structures and depicted a
* Hai-Feng Zhang [email protected] 1
College of Electronic and Optical Engineering & College of Microelectronics, Nanjing University of Posts and Telecommunications, Nanjing 210023, China
2
State Key Laboratory of Millimeter Waves of Southeast University, Nanjing 210096, China
novel structure that the dielectric and semiconductor layers were laid perpendicularly on the metal reflector [13]. Because the water-based and liquid-metal-based absorbers avoid the narrow absorption frequen
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