Ultrathin hybrid absorber based on high-order metamaterial

Abstract

In this work, we utilized a hybrid resonator to achieve near-perfect and dual-band absorption in the VHF and the LTE/Bluetooth/WiMAX bands. An electromagnetic (EM) wave at an oblique incidence was captured efficiently by exciting the fundamental magnetic resonances at 106 and 123.4 MHz. In particular, the effective thickness of the metamaterial perfect absorber (in comparison with the working wavelength ) is miniaturized to be at the high-order resonances (induced in the 2.0–4.0 GHz range) at a specific incident angle of EM wave, = 45°, 30°, 15° and = 5°. Our results contribute to the realization of meta-devices, such as sensors, optical filters/switchers, photodetectors, and energy converters, for future applications in the radio to the microwave frequency bands.

Full 360° Terahertz Dynamic Phase Modulation Based on Doubly Resonant Graphene–Metal Hybrid Metasurfaces

“…Metasurfaces have attracted increasing attention in the manipulation of the phase, amplitude, polarisation and wavefront of electromagnetic waves due to their appealing qualities including their compactness, easy integration and low loss [1][2][3][4]. Among these functionalities, the phase modulation is of particular importance [5] since it can lead to diverse relevant applications such as holographic imaging [6], polarisation manipulations [7], wavefront control [8,9], and absorbers [10,11]. Although various metasurfaces, either based on metals or based on all-dielectrics, have been designed or demonstrated to achieve full 360 • phase modulations [1,12], most of these metasurface-based phase modulators are passive devices and cannot be actively tuned after fabrication.…”