Open AccessDesign and analysis of perfect terahertz metamaterial absorber by a novel dynamic circuit model
Author(s) -
Mohammad P. Hokmabadi,
David S. Wilbert,
Patrick Kung,
Seongsin M. Kim
Publication year - 2013
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.21.016455
Subject(s) - terahertz radiation , metamaterial , materials science , metamaterial absorber , optics , absorption (acoustics) , interference (communication) , terahertz spectroscopy and technology , quasistatic process , resonance (particle physics) , equivalent circuit , optoelectronics , tunable metamaterials , physics , telecommunications , computer science , channel (broadcasting) , particle physics , quantum mechanics , voltage
Metamaterial terahertz absorbers composed of a frequency selective layer followed by a spacer and a metallic backplane have recently attracted great attention as a device to detect terahertz radiation. In this work, we present a quasistatic dynamic circuit model that can decently describe operational principle of metamaterial terahertz absorbers based on interference theory of reflected waves. The model comprises two series LC resonance components, one for resonance in frequency selective surface (FSS) and another for resonance inside the spacer. Absorption frequency is dominantly determined by the LC of FSS while the spacer LC changes slightly the magnitude and frequency of absorption. This model fits perfectly for both simulated and experimental data. By using this model, we study our designed absorber and we analyze the effect of changing in spacer thickness and metal conductivity on absorption spectrum.