Multiband Metamaterial Absorber in a Ring Structure Base on High-order Magnetic Resonance

Abstract

We proposed a multiband metamaterial absorber(MMA) based on high-order magnetic resonance using ring-shaped structures. This MMA is not only simple with highly symmetric geometry but also effectively absorptive with multi-band and down- scalability. It was found that the absorption occurred at some specific frequencies, which are three times and five times higher than that of common structures, originates from the magnetic resonances. In particular, the obtained results can be theoretically explained by using the LC circuit model. In addition, by scaling down the unit-cell size, the third- and fifth-order magnetic resonances are created at the THz frequencies. The presence of multiple absorption peaks opens the possibility for MMAs working from the GHz to the THz band.We proposed a multiband metamaterial absorber(MMA) based on high-order magnetic resonance using ring-shaped structures. This MMA is not only simple with highly symmetric geometry but also effectively absorptive with multi-band and down- scalability. It was found that the absorption occurred at some specific frequencies, which are three times and five times higher than that of common structures, originates from the magnetic resonances. In particular, the obtained results can be theoretically explained by using the LC circuit model. In addition, by scaling down the unit-cell size, the third- and fifth-order magnetic resonances are created at the THz frequencies. The presence of multiple absorption peaks opens the possibility for MMAs working from the GHz to the THz band.

A Rectangle-quartet Metamaterial for Dual-band Perfect Absorption in the Visible Region

“…For H-axial symmetry case at normal incidence, the absorption frequency can be determined by f H = 727.1 THz (with γ = 0.44, L eff = (t s + 2t m ) µw l and C eff = ε 0 εγ lw t d ). The different values of geometrical factor γ in the effective capacitance due to the induced charges are accumulated at a specific area on the top and bottom metallic layer (at different magnetic resonances) [34][35][36]. These calculated results are agreed well with the simulated ones.…”

Dual-Band, Polarization-Insensitive, Ultrathin and Flexible Metamaterial Absorber Based on High-Order Magnetic Resonance

“…Khuyen et al investigated the establishment of dual-band and high-order behavior in an ultrathin MA by controlling the oblique incidence of an electromagnetic wave in which the excited 3rd-harmonic resonance resulted in the appearance of high-order peaks [33]. Hien et al proposed a triple-band MA, resulting from the third-and fifth-order magnetic resonances using ring-shaped structures [34]. In the discussion above, the high-order absorption was generated mainly by the excitation of odd-order magnetic resonances, while the even-order magnetic resonances are rare, owing to the dark-mode nature.…”