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

Abstract

We demonstrate a dual-band, polarization-insensitive, ultrathin and flexible metamaterial absorber (MA), based on high-order magnetic resonance. By exploiting a flexible polyimide substrate, the thickness of MA came to be 1/148 of the working wavelength. The absorption performance of the proposed structure was investigated for both planar and bending models. In the case of the planar model, a single peak was achieved at a frequency of 4.3 GHz, with an absorption of 98%. Furthermore, additional high-order absorption peaks were obtained by the bending structure on a cylindrical surface, while the fundamental peak with a high absorption was maintained well. Our work might be useful for the realization and the development of future devices, such as emitters, detectors, sensors, and energy converters.

Metamaterial Perfect Absorbers for Controlling Bandwidth: Single-Peak/Multiple-Peaks/Tailored-Band/Broadband

“…Moreover, they have also been utilized to develop high-performance bolometers and photo-detectors, with potential applications in imaging and sensing technologies [19,20]. The metamaterial absorbers are essentially ultrathin structures with dimensions smaller than one-tenth of the operating wavelength [21]. These structures are lightweight and highly flexible, making them easily integrated into existing electronic systems and devices [22,23].…”

Toroidal Dipole Excitation in Metamaterial Perfect Absorber Consisting of Dielectric Nanodisks Quadrumer Clusters and Spacer on Metal Substrate

“…MPAs can find promising applications in many regions including thermophotovoltaics [2,3], infrared stealth [4,5], radiative cooling [6,7], infrared photodetectors [8,9], sensors [10][11][12][13], and modulators [14,15] up to date since the first MPA was demonstrated in microwave frequency [16]. Physical mechanism to design MPA's perfect absorption can usually be attributed to electromagnetic resonance including electric and magnetic multipoles [17][18][19], coupling effects between multipoles [20], and critical coupling in the bound states in the continuum [21]. Recently, a new kind of resonance dominated by toroidal dipole has attracted considerable and growing attention owing to it violates both the space-inversion and time-reversal symmetries [22], which may facilitate to design new kind of MPA.…”