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...

Invisibility has been a topic of long-standing interest owing to the advent metamaterials and transformation optics, but still faces open challenges after its tremendous development in recent decades. One big is narrow bandwidth, as realization an invisibility cloak usually based on metamaterial-an artificial composite material composed subwavelength resonator structures that are always associated with dispersion. Different from previous works have tried eliminate dispersion enhance...

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...

Topological photonics has emerged as a promising field in that is able to shape the science and technology of light. As significant degree freedom, valley introduced design construct photonic topological phases, with encouraging recent progress applications ranging from on‐chip communications terahertz lasers. Herein, development reviewed, both perspectives fundamental physics practical applications. The unique valley‐contrasting determines bulk topology bulk‐boundary correspondence phases...

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...

Spin-orbit coupling, a fundamental mechanism underlying topological insulators, has been introduced to construct the latter's photonic analogs, or insulators (PTIs). However, intrinsic lack of electronic spin in systems leads various imperfections emulating behaviors insulators. For example, recently demonstrated three-dimensional (3D) PTI, surface states emerge, not on single crystal as 3D insulator, but along an internal domain wall between two PTIs. Here, by fully abolishing spin-orbit we...

Abstract Metasurfaces have powerful abilities to manipulate the properties of electromagnetic waves flexibly, especially modulation polarization state for both linearly polarized (LP) and circularly (CP) waves. However, transmission efficiency cross-polarization conversion by a single-layer metasurface has low theoretical upper limit 25% bandwidth is usually narrow, which cannot be resolved their simple additions. Here, we efficiently coupling in multilayer promote Fabry-Perot resonance, so...

Metasurfaces provide an alternative way to design three-dimensional arbitrary-shaped carpet cloaks with ultrathin thicknesses. Nevertheless, the previous metasurface work only at a single frequency. To overcome this challenge, we here propose macroscopic cloak. The cloak is designed of few layers that exhibit special spatial distribution conductance and inductance in unit cell; therefore, it can fully control reflection phases several independent frequencies simultaneously. Because this,...

Time photonic crystals are media in which their electromagnetic parameters modulated periodically time, showing promising applications non-resonant lasers and particle accelerators, among others. Traditionally utilized to study space crystals, topological band theory has also been translated recently analyze time with inversion symmetry, enabling the construction of temporal version edge states. However, disorder can readily break symmetry practice, hence likely destroying states associated...

Abstract Cherenkov radiation (CR) is a fascinating phenomenon that occurs not only in electromagnetic (EM) waves but also water waves. The V‐shaped wake formed by moving object on the surface results from constructive interference of different wavelengths, similar to CR. We designed and fabricated one‐dimensional (1D) wave crystal analogize behavior particles This exhibits band structure with both positive (positive group velocity) negative slopes (negative velocity), exciting directing...

Abstract Pseudospin‐dependent acoustic topological insulators (ATIs) with high‐robustness edge states have recently attracted as surge of interest owing to their potential applications, such one‐way sound transport and communications. Despite the rapid development pseudospin‐dependent ATIs, most existing efforts are limited monolayer, restricting degree freedoms achieve novel physical phenomena device applications. Here, a series ATIs composed dual‐layer honeycomb‐lattice sonic crystals is...

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.

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...

Abstract Localized spoof surface plasmons (LSSPs) have recently emerged as a new research frontier due to their unique properties and increasing applications. Despite the importance, most of current researches only focus on electric/magnetic LSSPs. Very recent has revealed that toroidal LSSPs, LSSPs modes with multipole moments, can be achieved at point defect in 2D groove metal array. However, this metamaterial shows limitations large volume poor compatibility photonic integrated circuits....

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...

Hiding an arbitrary object with a cloak at distance from is of great significance in scientific research, but remains unrealized as practical device. In this paper, we propose the first experimental realization remote cloaking device that makes any located certain invisible direct current (DC) frequency. A negative resistor network active elements used to achieve function DC cloak. Based on network, can remotely generate hidden region without distorting currents far cloaked region. The...

Recent development of topological photonics has enabled photonic energy flow robust against disorders. On the other hand, waveguiding in substrate-integrated planar platforms is significant for microwave and mm-wave technology. Here, we propose crystals (PhCs) that support pseudospin-dependent edge states. We verify robustness electromagnetic-wave (EM-wave) transport through sharply twisted corners, random defects, or a channel intersection both numerically experimentally at frequencies. The...

This article presents a novel toroidal metasurface that is able to support response at almost all incident angles for transverse magnetic (TM) wave the microwave range. A flat band observed from calculated structure where radiation power of highest around 7.51 GHz. high transmission resonant frequency simulated and measured coefficients with different angles, whereas lower rest The resonance sensitivity 0.78 GHz/refraction index unit (RIU) experimentally demonstrated, which very sensitive...