Affiliation of Author(s):[1]Univ Elect Sci & Technol China, State Key Lab Elect Films & Integrated Devices, Chengdu 610054, Peoples R China
Journal:OPTICS EXPRESS
Key Words:Circular waveguides - Electric lines - Energy utilization - Metamaterials - Potential energy - Scattering parameters - Transmission line theory - Transmissions - Wave energy conversion
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. (C) 2009 Optical Society of America
Document Type:Article
Volume:17
Issue:22
Page Number:20256-20265
ISSN No.:1094-4087
Translation or Not:no