A full-polarization arbitrary-shaped 3D metasurface cloak with preserved amplitude and phase in microwave frequencies is experimentally demonstrated. By taking the unique feature of metasurfaces, it shown that can completely restore polarization, amplitude, light for full polarization as if was incident on a flat mirror.

Origami is the art of folding two-dimensional (2D) materials, such as a flat sheet paper, into complex and elaborate three-dimensional (3D) objects. This study reports origami-based metamaterials whose electromagnetic responses are dynamically controllable via switching state Miura-ori split-ring resonators. The deformation unit along third dimension induces net electric magnetic dipoles resonators parallel or anti-parallel to each other, leading strong chiral responses. Circular dichroism...

Metasurfaces, with intrinsically planar nature and subwavelength thickness, provide us unconventional methodologies to not only mold the flow of propagating waves but also manipulate near-field waves. Plasmonic metasurfaces topological transition for controlling surface plasmon polaritons (SPPs) recently have been experimentally demonstrated, which, however, are limited optical frequencies. In this work, we proposed characterized an ultrathin metasurface manipulating spoof SPPs at low...

Abstract Metasurfaces, the phase‐engineered quasi‐2D interfaces, have attracted intensive interest due to their great capabilities in manipulating reflection, refraction and transmission of electromagnetic waves. Here, we demonstrate design realization a gradient chiral metamirror tailored for spin‐selective anomalous reflection based on theory Pancharatnam‐Berry phase. Asymmetric split ring resonators are employed as basic meta‐atoms strong circular dichroism. Dispersionless phase...

Chiral metamirrors are recently proposed metadevices that have the ability of selective reflection for designated circularly polarized waves. However, previous chiral only work in a narrow band, which would limit their potential applications engineering. Here, we propose an approach towards broadband spin-selective absorption. By combining resonant modes two asymmetric split-ring resonators, design and construct metamirror absorbs left-handed waves over broad frequency range. The measured...

The ancient paper craft of kirigami has recently emerged as a potential tool for the design functional materials. Inspired by concept, we propose class kirigami-based metamaterials whose electromagnetic functionalities can be switched between nonchiral and chiral states stretching predesigned split-ring resonator array. Single-band, dual-band, broadband circular polarizers with reconfigurable performance are experimentally demonstrated maximum dichroism 0.88, 0.94, 0.92, respectively....

Abstract Metamaterials/metasurfaces, which have subwavelength resonating unit cells (i.e., meta‐atoms), can enable unprecedented control over the flow of light. Despite their significant progress, achieving dynamical both energy and momentum light remains a challenge. Here, mechanically tunable metawall capable either absorbing or modulating momentum, by incorporating magnetic meta‐atoms into 3D printed origami grating, is theoretically designed experimentally realized. Through mechanical...

Abstract Free‐electron radiation phenomena facilitate enticing potential to create light emission with highly tunable spectra, covering hard‐to‐reach frequencies ranging from microwave X‐ray. Consequently, they take part in many applications such as on‐chip sources, particle accelerators, and medical imaging. While their spectral tunability is extremely high, polarizability usually much harder control. Such limitations are especially apparent all free electron based spontaneous the...

Photonic topological states, providing light-manipulation approaches in robust manners, have attracted intense attention. Connecting photonic states with far-field degrees of freedom (d.o.f.) has given rise to fruitful phenomena. Recently emerged higher-order insulators (HOTIs), hosting boundary two or more dimensions lower than those bulk, offer new paradigms localize transport light topologically extended dimensionalities. However, HOTIs not been related d.o.f. radiation fields yet. Here,...

A broadband low-profile high-gain folded transmitarray antenna (FTA) is proposed to generate orbital angular momentum (OAM) with circular polarization. chiral metasurface employed as the top layer function of reflecting anticipant circularly polarized (CP) incident waves while transmitting orthogonal ones. The geometric phase then introduced achieve 360° coverage transmission without affecting reflection one. To obtain a and compact planar source, <inline-formula...

The flexible and conformal interconnects for electronic systems as a potential signal transmission device have great prospects in body-worn or wearable applications. High-efficiency wave propagation structure deformation around human body at radio communication are still confronted with huge challenges due to the lack of methods control achieve deformable simultaneously. Here, inspired by kirigami technology, new paradigm construct spoof plasmonic (SPIs) that support radiofrequency (RF)...

We propose a method to design bifunctional acoustic lens using metamaterials that possess separate functions at different directions. The proposed can be implemented in practice with subwavelength unit cells exhibiting effective anisotropic parameters. With this methodology, we experimentally demonstrate an Luneburg-fisheye operational frequencies from 6300 Hz 7300 Hz. Additionally, square is focal lengths for multi This paves the way manipulating energy flows functional lenses.

Abstract Retroreflectors made of gradient metasurfaces have recently attracted intense interests due to their ability in reflecting incident light back its source. So far, the current retroreflectors can only flip transverse momenta photons specific incidence angles and thus limitations wide‐angle applications. Here, a switchable metagrating based retroreflector is proposed for high‐efficient spin‐locked retroreflection suppression undesired diffractions. Upon reflection, handedness waves...

Terahertz time-domain spectroscopy (THz-TDS) technology has received wide attention and rapid development in recent decades, been applied as an effective detection tool various technical fields. Aiming at the problems of low algorithmic efficiency easy to fall into local optimisation THz-TDS thickness inversion multilayered layered materials, a high-precision layer measurement method based on improved Whale Optimization Algorithm (WOA) is proposed. The model parameter optimised by...

The concept of an invisibility cloak is a fixture science fiction, fantasy, and the collective imagination. However, real device that can hide object from sight in visible light absolutely any viewpoint would be extremely challenging to build. main obstacle creating such coupling electromagnetic components light, which necessitate use complex materials with specific permittivity permeability tensors. Previous cloaking solutions have involved circumventing this by functioning either static...

Moving electrons interacting with media can give rise to electromagnetic radiations and has been emerged as a promising platform for particle detection, spectroscopies, free-electron lasers. In this letter, we investigate the Smith-Purcell radiation from helical metagratings, chiral structures similar deoxyribonucleic acid (DNA), in order understand interplay between electrons, photons, object chirality. Spiral field patterns be generated while introducing gradient azimuthal phase...

Diodelike spin-orbit interactions (SOIs) of light at metasurfaces bring novel functionalities to optical devices but have never been achieved so far. In this paper, we experimentally demonstrate a diodelike asymmetric metadevice that exhibits SOIs in chiral metasurfaces. The exploited physical mechanism is based on the maximization polarization conversion for designated circularly polarized transmission. Chiral metaatoms are employed enhance interaction between spin angular momentum and...

Abstract Metasurfaces with engineered phase discontinuity offer extra degrees of freedom to control the angular spectrum characteristics light and can be used construct planar metalenses a variety anomalous functionalities. Here, off‐resonance spin‐locked metasurfaces empowered by quasi‐bound states in continuum are reported, order achieve concept hybridized analog computing over both frequency domains. By introducing two types asymmetric degrees, high‐quality resonance symmetry‐protected...

Orbital angular momentum (OAM) has recently attracted extensive attention in the radio frequency domain due to its potential applications various areas. In OAM-based communication system, development of OAM-generating antennas lies at heart matter generate and receive vortex beams. this work, a multiplexing/demultiplexing millimeter-wave OAM antenna based on traveling-wave circular loop structure is proposed experimentally demonstrated. The feeding networks are implemented using waveguide...

Optical nonreciprocity, stemming from the deviation of Lorentz reciprocity theorem, holds significant interest in realm optics and electromagnetics. Here, we propose experimentally demonstrate broadband nonreciprocal transmission via a low-biased magnetic Kerker-type dimer metasurface. The designed magneto-optical metasurface comprises three layers metal sandwiched between two gyromagnetic near-zero thickness slabs. dimers broaden isolation bandwidth utilizing multiple resonances where...

Spoof surface plasmon polaritons (SSPPs) have aroused widespread concern due to their strong ability in field confinement at low frequencies. For miniaturized integrated circuits, there is a pressing need for nonreciprocal spoof plasmonic platforms that provide diode functionalities. In this letter, we report the realization of phase shifting SSPPs using transverse Faraday effect. A coupled line constructed by flipped stacking two corrugated metallic strips, order enhance mode coupling...

The metasurface has recently emerged as a powerful platform to engineer wave packets of free electron radiation at the mesoscale. Here, we propose that Airy beams can be generated when moving electrons interact with bianisotropic metasurfaces. By changing intrinsic coupling strength, full amplitude coverage and 0-to-π phase switching Smith-Purcell realized from meta-atoms. This unusual property shifts front assembled beam toward parabolic trajectory. Experimental implementation displays...

Abstract In the past decades, metamaterial absorbers that show customizable absorption and reduced thicknesses have witnessed an impressive success in a variety of applications light manipulation. Here, we study nonreciprocal coupling effect between resonant modes discover chiral behavior under asymmetric phase coupling. A coupled-mode theory is established to quantitatively analyze inherent chiro-optical effects degeneration mechanism resonances for time-reversed breaking disclosed....