Selective wave-transmitting electromagnetic absorber through composite metasurface

Abstract

Selective wave-transmitting absorbers which have one or more narrow transmission bands inside a wide absorption band are often demanded in wireless communication and radome applications for reducing the coupling between different systems, improving anti-jamming capability, and reducing antennas’ radar cross section. Here we propose a feasible method that utilizing composite of two metasurfaces with different polarization dependent characteristics, one works as electromagnetic polarization rotator and the other as a wideband polarization dependent electromagnetic wave absorber. The polarization rotator produces a cross polarization output in the wave-transmitting band, while preserves the polarization of the incidence outside the band. The metasurface absorber works for certain linear polarization with a much wider absorption band covering the wave-transmitting frequency. When combining these two metasurfaces properly, the whole structure behaves as a wideband absorber with a certain frequency transmission window. The proposal may be applied in radome designs to reduce the radar cross section of antenna or improving the electromagnetic compatibility in communication devices.

A review of dielectric optical metasurfaces for wavefront control

“…We should note here that the applications of optical metasurfaces in the general sense of the word (i.e., patterned thin layers on a substrate) go beyond spatial wavefront manipulation. Thin light absorbers [79][80][81][82][83][84][85][86][87][88][89][90][91][92][93], optical filters [94][95][96][97][98][99][100][101][102][103][104][105][106], nonlinear [107][108][109][110][111][112][113][114], and anapole metasurfaces [115,116] are a few examples of such elements. This review is focused on applications of metasurfaces in wavefront manipulation, and therefore it doesn't cover these other types of metasurfaces.…”

A Review of Metasurfaces for Microwave Energy Transmission and Harvesting in Wireless Powered Networks

“…The more common realization of metasurfaces consists of metallic patterns layered on a dielectric substrate. Although single layered metallic meta-cells are often employed, multi-layered implementations have been shown to increase the degrees of freedom in manipulating incident EM waves, leading to enhanced features [43]- [45]. All-dielectric metasurface implementations have also been reported [46]- [49], made possible by the fact that dielectric resonators exhibit geometrically tunable electric and magnetic resonances [43].…”

A Plasmonic Infrared Multiple-Channel Filter Based on Gold Composite Nanocavities Metasurface

“…Periodic nanometallic cavities arrays in metamaterials support plasmons near-field coupling among cavities [ 18 ], leading to collective resonances such as the EOT phenomenon at selectable wavelength. Further on, the composite cavities structure is introduced into the metamaterial [ 19 , 20 , 21 ], which generates an interaction giving rise to plasmonic hybridization and strong optical field coupling among spectrally-overlapped modes, resulting in the additive spectral response of metamaterial [ 22 , 23 , 24 , 25 ]. For example, a polarization-insensitive NIR filter is presently based on asymmetry metallic elliptical and circle nanocavities array metasurface [ 26 ], exhibiting 79 nm narrow linewidth generated by a Fano resonance.…”