title: Transmission line model and fields analysis of metamaterial absorber in the terahertz band.
abstract: Metamaterial (MM) absorber is a novel device to provide near-unity absorption to electromagnetic wave, which is especially important in the terahertz (THz) band. However, the principal physics of MM absorber is still far from being understood. In this work, a transmission line (TL) model for MM absorber was proposed, and with this model the S-parameters, energy consumption, and the power loss density of the absorber were calculated. By this TL model, the asymmetric phenomenon of THz absorption in MM absorber is unambiguously demonstrated, and it clarifies that strong absorption of this absorber under studied is mainly related to the LC resonance of the split-ring-resonator structure. The distribution of power loss density in the absorber indicates that the electromagnetic wave is firstly concentrated into some specific locations of the absorber and then be strongly consumed. This feature as electromagnetic wave trapper renders MM absorber a potential energy converter. Based on TL model, some design strategies to widen the absorption band were also proposed for the purposes to extend its application areas.
authors.affiliation: State Key Laboratory of Electronic Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China. qywen@uestc.edu.cn
authors.forename: Qi-Ye
authors.initials: QY
authors.lastname: Wen
authors.forename: Yun-Song
authors.initials: YS
authors.lastname: Xie
authors.forename: Huai-Wu
authors.initials: HW
authors.lastname: Zhang
authors.forename: Qing-Hui
authors.initials: QH
authors.lastname: Yang
authors.forename: Yuan-Xun
authors.initials: YX
authors.lastname: Li
authors.forename: Ying-Li
authors.initials: YL
authors.lastname: Liu
mesh_terms: D003198:Computer Simulation; D008420:Manufactured Materials; D008962:Models, Theoretical; D012031:Refractometry / Q000379:methods*; D012542:Scattering, Radiation; D055053:Terahertz Radiation