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...

A cloak that can hide living creatures from sight is a common feature of mythology but still remains unrealized as practical device. To preserve the wave phase, previous cloaking solution proposed by Pendry and colleagues required transformation electromagnetic space around hidden object in such way rays bending inside region have to travel faster than those passing it by. This difficult phase preservation requirement main obstacle for building broadband polarization-insensitive large...

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...

Abstract The realization of a metasurface cloak for the simultaneous invisibility multiple sources presents long‐standing scientific challenge. Ideally, establishment multisource cloak, must provide wide phase coverage and angular stability in single architecture, especially broadband, wide‐angle, even omnidirectional scenarios. However, achieving this goal has proven to be elusive thus far. Current approaches implementing metasurface‐based involve both active passive metasurface. These...

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...

On-chip single-photon sources with high repetition rates are a fundamental block for quantum photonics and can enable applications such as high-speed communication or information processing. Ideally, require large on-chip photon extraction decay rate, especially over broad spectral range, but this goal has remained elusive so far. Current approaches implemented to enhance the spontaneous emission rate include photonic crystals, optical cavities, metallic nanowires, metamaterials. These...

Spectral Graph Neural Networks effectively handle graphs with different homophily levels, low-pass filter mining feature smoothness and high-pass capturing differences. When these distinct filters could naturally form two opposite views for self-supervised learning, the commonalities between counterparts same node remain unexplored, leading to suboptimal performance. In this paper, a simple yet effective contrastive framework, LOHA, is proposed address gap. LOHA optimally leverages by...

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...

Spectral Graph Neural Networks effectively handle graphs with different homophily levels, low-pass filter mining feature smoothness and high-pass capturing differences. When these distinct filters could naturally form two opposite views for self-supervised learning, the commonalities between counterparts same node remain unexplored, leading to suboptimal performance. In this paper, a simple yet effective contrastive framework, LOHA, is proposed address gap. LOHA optimally leverages 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...

Abstract A fundamental cornerstone in nanophotonics is the ability to achieve hyperbolic dispersion of surface plasmons, which shows excellent potentials many unique applications, such as near‐field heat transport, planar hyperlens, strongly enhanced spontaneous emission, and so forth. The metasurfaces with an ability, however, are currently restricted electric metasurface paradigm, realization magnetic remains elusive despite importance manipulating plasmons (MSPs) at subwavelength scale....

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...

ABSTRACT Inspired by the concept of superscattering in optics, we for first time theoretically predict and experimentally demonstrate phenomenon water waves. The subwavelength superscatterer is constructed multi-layered concentric cylinders with an inhomogeneous depth profile. breaks long-held single-channel scattering limit several times thus significantly enhances total strength. underlying mechanism originates from near degeneracy resonances multiple channels. We fabricate prototype...

Dielectric environment engineering is an efficient and general approach to manipulating polaritons. Liquids serving as the surrounding media of polaritons have been used shift polariton dispersions tailor wavefronts. However, those liquid-based methods so far limited their static states, not fully unleashing promise offered by mobility liquids. Here, we propose a microfluidic strategy for manipulation merging polaritonics with microfluidics. The diffusion fluids causes gradient refractive...

Abstract Hiding an isolated object in free space using a transmissive invisibility cloak has become significant research area, propelled by advancements metamaterials and transformation optics over the past decade. Despite availability of various simplified methods for implementing cloaks, issues such as impedance mismatches narrow working bandwidths often arise, posing challenges. Achieving broadband proven to be particularly arduous. This study presents near‐perfect one‐directional...

Natural animals such as crotaline and boid snakes have the ability to detect infrared radiation, which is emitted by any living object while it invisible human eyes. To evade thermal detection, various attempts, stealth or low observability technologies, are generally made reduce signature. However, validity of these technologies background dependent. In this paper, first, large‐scale, far‐infrared, unidirectional invisibility cloak in air environment experimentally demonstrated. The...