Open AccessTransmission line model and fields analysis of metamaterial absorber in the terahertz band
Author(s) -
Qiye Wen,
Yuee Xie,
Huaiwu Zhang,
Qinghui Yang,
Yuanxun Li,
Yingli Liu
Publication year - 2009
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.17.020256
Subject(s) - metamaterial absorber , terahertz radiation , metamaterial , optics , absorption (acoustics) , resonator , split ring resonator , electromagnetic radiation , materials science , transmission line , resonance (particle physics) , optoelectronics , physics , tunable metamaterials , telecommunications , atomic physics , computer science
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.