Taming electromagnetic metamaterials for isotropic perfect absorbers

Abstract

Loaded metamaterial perfect absorber using substrate integrated cavity

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

“…In general, perfect absorption can be regarded as a difficult task in the optical region [21,23,24], polarization dependence [18], and operation in a narrow frequency range [18,22] due to their complex structures for the recent fabrication techniques. To overcome the above disadvantages, we attempt to apply the basic ring-shaped structure because of high-symmetry property.…”

“…To date, MAs have been demonstrated in every technologically relevant spectral range, from the microwave [10,11,19], the THz [15,16], NIR [20] to the optical range [21]. However, most recent studies focus on the fundamental absorption mechanism of MM [9][10][11]22]. Moreover, one of the most interesting properties of MMs is that we can design and fabricate them working in the desired frequency range, from GHz to THz or even in the visible region.…”

Angle-Insensitive Microwave Metamaterial Absorbers Operating at Transmission Mode

“…Recently, a potential solution has been reported operating at the transmission mode without the metallic mirror [23]. The desired absorption peak is obtained by matching the electric and magnetic resonant losses at the same frequency range while allowing the waves to be transmitted outside the absorption band.…”

“…Unfortunately, the magnetic and electric resonant frequencies have shown different sensitivities to the incident waves and the resonant superposition lasts only for the incident angles less than 5 degrees. The high absorption behavior hence can only be observed at the normal incident angle, putting an unfortunate limitation on their promising applicability [23]. In order to bridge this gap, we propose a disk-pair (DP) dimer that can exhibit an angle-insensitive bidirectional high absorptivity at transmission mode.…”