Abstract
Dual band metamaterial perfect absorbers with two absorption bands are highly desirable because of their potential application areas such as detectors, transceiver system, and spectroscopic imagers. However, most of these dual band metamaterial absorbers proposed were based on resonances of metal patterns. Here, we numerically and experimentally demonstrate a dual band metamaterial perfect absorber composed of artificial dielectric “molecules” with high symmetry. The artificial dielectric “molecule” consists of four “atoms” of two different sizes corresponding to two absorption bands with near unity absorptivity. Numerical and experimental absorptivity verify that the dual-band metamaterial absorber is polarization insensitive and can operate in wide-angle incidence.
Highlights
Crystal is formed by periodically arranged atoms, ions or molecules bonding together by attractive and repulsive forces
Z (ω) + Z0(ω) where Z (ω) = μ (ω)μ0/ε(ω)ε0 is the impedance of the metamaterial absorber and Z0 = μ0/ε0 is the impedance of free space
We built a dielectric “molecules” based dual-band metamaterial absorber sample according to the predesigned structure
Summary
Crystal is formed by periodically arranged atoms, ions or molecules bonding together by attractive and repulsive forces. If we want reflectivity R = 0, the impedance match condition must be met: Z (ω) = Z0(ω), leading to ε(ω) =μ(ω) Metamaterials make it possible to tune the effective electric permittivity ε(ω) and magnetic permeability μ(ω) simultaneously. Metamaterial absorbers can be designed to perform near unity absorption at certain frequency by impedance-matched to free space ε(ω) =μ(ω). Dual-band metamaterial perfect absorbers with two absorption bands were proposed subsequently because of their potential application areas such as detectors, transceiver system, and spectroscopic imagers[33,34,35,36,37,38] All these dual-band metamaterial absorbers are based on metal “atoms” with different patterns. We numerically and experimentally proposed a dual-band metamaterial perfect absorber with near unity absorptivity based on dielectric cubic “molecules” composed of four “atoms” of two different sizes
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