We report the design, fabrication, and measurement of a microwave triple-band absorber. The compact single unit cell consists three nested electric closed-ring resonators metallic ground plane separated by dielectric layer. Simulation experimental results show that absorber has distinctive absorption peaks at frequencies 4.06 GHz, 6.73 9.22 GHz with rates 0.99, 0.93, 0.95, respectively. is valid to wide range incident angles for both transverse (TE) magnetic (TM) polarizations. promising...

Metasurfaces enable a new paradigm to control electromagnetic waves by manipulating subwavelength artificial structures within just fraction of wavelength. Despite the rapid growth, simultaneously achieving low-dimensionality, high transmission efficiency, real-time continuous reconfigurability, and wide variety reprogrammable functions is still very challenging, forcing researchers realize one or few aforementioned features in design. This study reports reconfigurable Huygens' metasurface...

Graphene can be utilized in designing tunable terahertz devices due to its tunability of sheet conductivity. In this paper, we combine the metamaterial having unit cell cross-shaped metallic resonator with double layer graphene wires realize polarization independent absorber spectral tuning at frequency. The absorption performance a peak frequency range 15% and almost perfect has been demonstrated by controlling Fermi energy that conveniently achieved adjusting bias voltage on layers....

In this paper a kind of chiral metamaterial structure is proposed that can achieve asymmetric transmission for forward and backward propagations linearly polarized electromagnetic (EM) waves. We first give theoretical analysis on bilayered with specific asymmetry enables the EM wave only linear polarization. Then by constructing proof-of-concept sample twisted split ring resonator patterns both sides dielectric slab, we demonstrate substantial polarizations, but none circular polarizations...

Janus monolayers, a class of two-faced 2D materials, have received significant attention in electronics, due to their unusual conduction properties stemming from inherent out-of-plane asymmetry. Their photonic counterparts recently allowed for the control hydrogenation/dehydrogenation processes, yielding drastically different responses opposite light excitation spins. A passive metasurface composed cascaded subwavelength anisotropic impedance sheets is demonstrated. By introducing rotational...

We demonstrate a controllable electromagnetic wave reflector/absorber for different polarizations with metamaterial involving resonant structures coupled diodes. Through biasing at voltages to turn ON and OFF the diodes, we are able switch structure between nearly total reflection absorption of particularly polarized incident wave. By arranging orthogonally orientated cells, can react waves by selectively corresponding Both numerical simulations microwave measurements have verified performance.

Controlling the conversion of light's spin angular momentum to orbital (OAM) is crucial for applications, including optical systems and wireless communication. In this regard, metasurfaces are often limited by difficulty producing independent spin-to-OAM conversions. This study uses a reflective, dual-helicity decoupled coding metasurface realize completely control OAM vortices two orthogonal helicities, achieving free combination distinctive topological charges, arbitrary helicity,...

Traditional honeycomb-like structural electromagnetic (EM)-wave-absorbing materials have been widely used in various equipment as multifunctional materials. However, current EM-wave-absorbing are limited by narrow absorption bandwidths and incidence angles because of their anisotropic morphology. The work presented here proposes a novel metastructure with an isotropic morphology inspired the gyroid microstructures seen Parides sesostris butterfly wings. A matching redesign methodology...

Abstract Reconfigurable metasurfaces have emerged as a versatile platform for reshaping the wireless environment into desirable form at low cost. Despite rapid growth, most of existing only support reflection operation or transmission operation, providing service coverage backward forward half‐space when they are used communications. Here, an intelligent programmable omni‐metasurface integrating mode, and duplex mode simultaneous modes in same polarization frequency channel is proposed,...

The concept of dual-polarized reconfigurable reflectarray (RRA) featuring beam control is proposed and demonstrated using a dual-channel programmable metasurface. p-i-n diodes are incorporated into each metasurface element as the active components to provide independent phase in two orthogonal polarization channels. By altering working states diode, well-defined scanning can be obtained. Element design, focal diameter ratio selection, discretized distributions carefully optimized ensure...

This paper presents the design, fabrication and measurement of a polarization insensitive microwave absorber based on metamaterial.The unit cell metamaterial consists four-fold rotational symmetric electric resonator cross structure printed each side print circuit board to realize both magnetic resonances achieve efficient absorption incident energy.Both full wave electromagnetic simulation fabricated demonstrate high up 97% for different polarized waves.To understand mechanism, analysis is...

Impedance metasurface is composed of electrical small scatters in two dimensional plane, which the surface impedance can be designed to produce desired reflection phase. Tunable phase achieved by incorporating active element into scatters, but tuning range limited. In this paper, an with full 360° control presented remove deficiency conventional approach. The unit cell a multiple resonance structure poles and one zero, capable providing variation within finite frequency band. Linear also...

Metasurfaces have promised great possibilities in full control of the electromagnetic wavefront by spatially manipulating phase characteristics across interface. Here, we report a scheme to realize broadband backward scattering reduction through diffusion-like microwave reflection utilizing flexible indium-tin-oxide (ITO)-based ultrathin coding metasurface (less than 0.1 wavelength thick) with high optical transparence. The is caused destructive interference scattered far-field wave, which...

Transmission and reflection are two fundamental properties of the electromagnetic wave propagation through obstacles. Full control both magnitude phase transmission independently important issue for free manipulation propagation. Here we employed equivalent principle, one theorem electromagnetics, to analyze required surface electric magnetic impedances a passive metasurface produce either arbitrary or phase. Based on analysis, tunable is proposed. It shown that can be tuned by 360° with...

Recently, a conformal surface plasmon (CSP) structure has been successfully proposed, which is very promising for application of planar plasmonic devices in the frequency ranging from microwave to mid-infrared [Proc. Natl. Acad. Sci. U.S.A. 110, 40-45 (2013)]. Here we investigated dispersions and electromagnetic (EM) field patterns symmetric CSP two sides metal strip are symmetrically corrugated by groove arrays. The can support both mode (even mode) anti-symmetric (odd wave propagation....

Abstract Ultrathin metasurface compromising various sub-wavelength meta-particles offers promising advantages in controlling electromagnetic wave by spatially manipulating the wavefront characteristics across interface. The recently proposed digital coding could even simplify design and optimization procedures due to digitalization of meta-particle geometry. However, current attempts implement still utilize several structural obtain certain responses, requiring time-consuming especially...

Recently, conformal surface plasmon (CSP) structure has been successfully proposed that could support spoof polaritons (SPPs) on corrugated metallic strip with ultrathin thickness [Proc. Natl. Acad. Sci. U.S.A. 110, 40-45 (2013)]. Such concept provides a flexible, conformal, and wave-guiding element, very promising for application of plasmonic devices, circuits in the frequency ranging from microwave to mid-infrared. In this work, we investigated dispersions field patterns high-order modes...

In this paper, broadband microwave absorbers utilizing water-based metamaterial structure elements have been proposed and investigated. We employ water into the unit-cell of absorber as primary resonant such water-droplet, or water-tube structure. By investigating modes coupling between surrounding dielectrics, it is found inherent multi-resonance structures could result in a absorption. For water-droplets design, 90% absorption has achieved from 7.5 GHz to 15 GHz, while for much broader...

Abstract Active metasurfaces incorporated with active elements can achieve tunable and/or reconfigurable functionalities controlled by external stimuli, providing a new platform that may radically change the way people dynamically manipulate electromagnetic waves. Despite rapid growth, most of so far are polarization‐sensitive structures only support responses for excitation certain single polarization. Here, an ultrathin anisotropic metasurface loaded voltage‐controlled varactors is...

Active metasurfaces pave a way for manipulating electromagnetic (EM) waves in real-time by incorporating with tunable materials or components, emerging as an attractive solution to achieve versatile EM functionalities dynamic fashions. However, most of the active demonstrated so far only support responses certain single frequency band, have obvious cross-talks that cannot provide dual-band independent operations, limiting their further uses practical applications. Here, we propose 1-bit...

This letter presents a switchable dual-polarized frequency-selective rasorber/absorber at low microwave frequency based on double-layered metallic resonant structure array loaded with lumped elements. It consists of an absorbing layer and bandpass surface PIN diodes, sandwiched air-spacer between them. The operating principle is analyzed the help equivalent circuit model. By biasing diodes or off, it can be easily switched rasorber absorber modes. When in mode, exhibits passband 1.6 GHz 1.7...

Abstract Polarization control is paramount in tailoring light‐matter interactions; hence, its versatile manipulation plays an important role science and technology. Metasurfaces have recently enacted diverse electromagnetic manipulations polarization optics. However, they only support one or a few functions single design. Here, arbitrary dynamic Poincaré sphere converter to implement full‐polarization optics with time‐varying metasurface demonstrated. As exemplary demonstration, loaded...

Abstract Kirigami technique, a method to reconfigure structures via mechanical approaches, has received much attention in material science, due its versatile and unconventional structural transformations. The counterparts the electromagnetic metamaterial field recently allowed for tunable control of responses. However, they are limited global tuning absorption, chirality, etc., leaving potential controlling spatially varying distribution therefore optical wavefront unexploited. Here, authors...