Abstract The recent rise of metamaterials opens new opportunities for absorbers due to their designed electrodynamic properties and effects, allowing the creation materials with effective values permittivity permeability that are not available in naturally occurring materials. Since first experimental demonstration 2008, literature has offered great advances metamaterial perfect (MMPAs) operating at frequencies from radio optical. Broadband indispensable thermophotovoltaics, photodetection,...

Abstract Simultaneously independent control of phase, amplitude, and polarization is pivotal yet challenging for manipulating electromagnetic waves by transmissive metasurfaces. Huygens' metasurface affords a high‐efficiency recipe primarily engineering phase‐only meta‐atoms, restricting itself from realizing unprecedentedly complex functions the transmission beam. Here, 3D chirality‐assisted concept relying on integrated magnetoelectric meta‐atoms proposed. It empowers completely decoupled...

Abstract Electromagnetic metasurface cloaks provide an alternative paradigm toward rendering arbitrarily shaped scatterers invisible. Most transformation-optics (TO) intrinsically need wavelength-scale volume/thickness, such that the incoming waves could have enough long paths to interact with structured meta-atoms in cloak region and consequently restore wavefront. Other challenges of TO include polarization-dependent operation avoid singular parameters composite cloaking materials...

In this letter, based on a corner-cut square metasurface, planar polarization conversion structure is presented and the application for wide band low-profile circular (CP) slot antenna proposed. The mechanisms achieving CP state from linearly polarized incident wave broadening working bandwidth of conventional are analyzed theoretically. achieved with numerical optimizations parameter studies. Both simulations measurements performed to demonstrate proposed antenna, good agreements obtained....

Metamaterial absorber (MMA), which is a kind of thin electromagnetic consisting sub-wavelength metamaterial resonators and can exhibit near-perfect absorption characteristics, has been widely investigated in recently years. The impedance matching theory was proposed to analyze the configuration MMA most literatures. Such theory, however, may not suitable interactions ground plane. interference on another hand, play effective approach for this problem presented recent studies, whereas little...

Abstract Achieving kaleidoscopic wavefront controls with a thin flat plate is pivotal for increasing data capacity yet still challenging in integrated optics. An anisotropic metasurface provides an efficient recipe primarily linear polarization, but less multiple functionalities at arbitrary spin states. Here, strategy of realizing spin‐decoupled high‐capacity multifunctional by multiplexing the frequency and wavevector degree freedom (DoF) reported. By integrating both geometric dynamic...

Abstract The fruitful progress toward light manipulation in reflective (R) or transmissive (T) geometry (half‐space) has facilitated strong aspiration towards full‐space wave control. Although R–T synergistic strategy promises large‐capacity and integrated functionality, it imposes difficulty challenges for direction of arrival (DoA) full space via an ultrathin flat device. As today, very limited demonstrations are reported single‐wavelength linear‐polarization operation space, significantly...

Metamaterials attain their behavior due to resonant interactions among subwavelength components and thus show specific designer features only in a very narrow frequency band. There is no simple way dynamically increase the operating bandwidth of narrowband metamaterial, but it may be possible change its central frequency, shifting spectral response new range. In this paper, we propose experimentally demonstrate metamaterial absorber that can shift by using mechanical means. The achieved...

We synthesize and systematically characterize a novel type of magnetically tunable metamaterial absorber (MA) by integrating ferrite as substrate or superstrate into conventional passive MA. The nearly perfect absorption tunability this device is studied both numerically experimentally within X-band (8-12 GHz) in rectangular waveguide setup. Our measurements clearly show that the resonant frequency MA can be shifted across wide band continuous adjustment magnetic field acting on ferrite....

This letter presents a new broadband circularly polarized (CP) planar monopole antenna with simple structure and compact size. Broadband CP operation is achieved by vertically extending one side of the ground plane, while cross-shaped presence slot in plane assure broad impedance bandwidth. The successfully simulated, prototype fabricated. Measurement results indicate that 3 dB axial-ratio bandwidth about 42.6% (2.6 GHz, 4.8-7.4 GHz), fully covered -10 55.5% (3.35 4.36-7.71 GHz)....

Metamaterial absorbers open a new door for the design of optical harvesting devices ranging from microwave to regimes. The top resonator in these structures is critical function metamaterial absorbers. resonant frequency, bandwidth, and maximum absorption mainly depend on choice material, shape, size resonator. generally impaired as changes, due high sensitivity impedance matching with medium. In this paper, we experimentally demonstrate perfect absorber unabated its resonator's changes....

Chaos has revolutionized the field of nonlinear science and stimulated foundational studies from neural networks, extreme event statistics, to physics electron transport. Recent in cavity optomechanics provide a new platform uncover quintessential architectures chaos generation underlying physics. Here, we report dynamical silicon-based monolithic optomechanical oscillators, enabled by strong coupled nonlinearities two-photon absorption induced Drude electron-hole plasma. Deterministic...

Achieving full-polarization ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi>σ</mml:mi> </mml:math> ) invisibility on an arbitrary three-dimensional (3D) platform is a long-held knotty issue yet extremely promising in real-world stealth applications. However, state-of-the-art cloaks typically work under specific polarization because the anisotropy and orientation-selective resonant nature of artificial materials made -immune operation elusive terribly...

A tunable broadband metamaterial absorber is demonstrated at microwave frequencies in this paper. The composed of ferrite slabs with large resonance beamwidths and a copper wire. theoretical analysis for the effective media parameters presented to show mechanism achieving perfect absorptivity characteristic. numerical results transmission, reflectance, indicate that exhibits near impedance-match free space high 98.2% one layer 99.97% two layers 9.9 GHz. bandwidth above 90% about 2.3...

In this communication, a compact and broadband coplanar waveguide-fed meandered-slot antenna is presented. Compact size of 0.3 × 0.2 λ <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> (30 20 mm on 1.6 thick FR4 dielectric substrate) achieved by employing modified meandered slot, slotted Y-shaped monopole, trident-shaped feed strip. The measurement results show an impedance bandwidth (defined for S <sub...

A high-efficiency inverse class-F microwave rectifier for wireless power transmission is described in this letter. The proposed harmonic termination network realized by connecting a λ/12 open-ended line parallel with the diode cathode, and λ/8 short-ended series anode. This structure yields compact layout, measurement results have demonstrated peak conversion efficiency of 80.4% an input 13 dBm at 2.35 GHz, larger than 60% within bandwidth 2.25-3 GHz wide range output loads.

In this article, a 2-D Airy beam is experimentally generated at microwave frequency by using simple and thin metasurface composed of single-layer square C-shaped complementary split-ring resonators (C-SRRs). It shown that the cross-polarization transmission coefficient, including magnitude phase, single C-SRR unit can be controlled modifying rotation angle, property herein used to reshape impinging field in accordance with desired profile. The designed then fabricated measure most...

Modern navigation systems integrate the global positioning system (GPS) with an inertial (INS), which complement each other for correct attitude and velocity determination. The core of INS integrates accelerometers gyroscopes used to measure forces angular rate in vehicular reference frame. With help by integrating acceleration compute distance, precision compact sufficient accuracy can provide small-error location Solid-state implementations, through coherent readout, a platform high...