The invisibility cloak, a long-standing fantastic dream for humans, has become more tangible with the development of metamaterials. Recently, metasurface-based cloaks have been proposed and realized significantly reduced thickness complexity cloaking shell. However, previous scheme is based on reflection-type metasurfaces thus limited to reflection geometry. In this work, by integrating wavefront tailoring functionality transparent wave tunneling zero-index materials, we unique type hybrid...

Abstract Reflection inherently occurs on the interfaces between different media. In order to perfectly manipulate waves interfaces, integration of antireflection function in metasurfaces is highly desired. this work, we demonstrate an approach realize exceptional that combine two vital functionalities and arbitrary phase manipulation deep subwavelength scale. Such ultrathin devices confer reflection-less transmission through impedance-mismatched with wavefront shapes. Theoretically...

Abstract The Brewster’s law predicts zero reflection of p-polarization on a dielectric surface at particular angle. However, when loss is introduced into the permittivity dielectric, Brewster condition breaks down and unavoidably appears. In this work, we found an exception to long-standing dilemma by creating class nonmagnetic anisotropic metamaterials, where anomalous effects with independently tunable absorption refraction emerge. This loss-independent effect bestowed extra degrees...

Rough surfaces lead to diffused light in both reflection and transmission, thereby blurring the reflected transmitted images. Here, we merge traditionally incompatible diffuse undistorted transmission by introducing concept of random-flip metasurfaces made randomly flipped components. These have a globally random phase that leads reflection, while local space inversion reciprocity principle ensure distortion-free transmission. Notably, metasurface reflects like rough surface yet transmits...

The long-standing paradox between matte appearance and transparency has deprived traditional materials of optical transparency. Here, we present a solution to this centuries-old conundrum by harnessing the potential disordered metasurfaces. Through construction random array meta-atoms tailored in asymmetric backgrounds, have created transparent surfaces that maintain clear regardless strength light scattering or their appearances. This remarkable property originates achievement highly...

To prevent the crosstalk between adjacent waveguides in photonic integrated circuits, minimum thickness of cladding layers is around half a wavelength, which imposes fundamental limitation to further integration and miniaturization circuits. Here, we reveal that epsilon-near-zero claddings, either isotropic or anisotropic, can break above bottleneck by prohibiting for modes with magnetic field polarized

Abstract Mesocrystals introduce high‐level orders, such as chirality, topology, and hierarchy to the crystallography, thus bring collective emergent properties beyond traditional crystals. Orthogonally modulating multiple degrees of light is highly pursued fully explore intrinsic multidimensional large‐scale parallel processing capability photon informatics. Unfortunately, it unachievable with light–matter interaction systems. Here, multi‐degree modulation realized based on hierarchical...

We introduce a programmable flip-metasurface that can dynamically control the reflection while leaving transmitted wavefront undistorted in an ultra-broad spectrum, i.e., same as of incidence. This metasurface is constructed by unique meta-atoms be switched between two flip states, which correspond to spatial inversion each other. Due reciprocity principle and symmetry, transmission independent regardless frequency. While conveniently controlled tuning states. Dynamical steering reflected...

Metasurfaces with spatially varying reflection phases have promised great possibilities in realizing diffusion-like backward scattering. However, most studies the field of metasurface reflectors focus on diffusion generated by a phase gradient from unit cells periodic grids. In this paper, we propose general idea integrating concept hyperuniform disordered structure to realize metasurface, where effect spatial distribution is taken into account more diffusion. A V-shaped utilized as cell for...

Getting wireless signals around obstacles or passing them through walls is proven to be challenging for electromagnetic waves with a short wavelength and some energy-efficient buildings due thick insulating materials. Here, we propose scheme of through-wall communication by applying purposely designed passive metalenses an asymmetric background medium the wall. An ultrathin metalens consisting three layers metallic patterns applied focus incoming other side wall high efficiency. The focusing...

Traditional microperforated panels (MPPs) and metamaterial-based sound absorbers rely on local resonances or multi-resonator designs, which limit their bandwidth, angular applicability, ease of fabrication. Leveraging the reciprocity theorem cavity resonances, we introduce a new class robust MPP absorbers, termed meta-MPPs, capable achieving ultrabroadband near-total absorption across range 0.37 to 10 kHz. These demonstrate average performance exceeding that traditional MPPs by over 100%,...

Total internal reflection generally occurs at incident angles beyond the critical angle, confining electromagnetic waves in dielectrics with higher refractive indices. In this work, we present a metasurface-based solution to transform such total into high-efficiency transmission. We demonstrate that phase-gradient antireflection metasurface designed on dielectric surface not only compensates for transverse wave vectors of and transmitted but also addresses impendence mismatch between two...

Abstract Topological photonic structures exhibit resilience to defects, allowing unidirectional light flow and promoting the development of robust devices with large information processing capacities. However, diversity topological boundary modes is typically governed by bulk-edge correspondence, which limits multidimensional multiplexing integration density next-generation systems. Here, we present a polycrystal approach based on domain wall engineering configure multi-band dispersion in...

We report a realization of three-dimensional (3D) electromagnetic void space. Despite occupying finite volume space, such medium is optically equivalent to an infinitesimal point where waves experience no phase accumulation. The 3D space realized by constructing all-dielectric photonic crystals that the effective permittivity and permeability vanish simultaneously, forming six-fold Dirac-like with linear dispersions at center Brillouin Zone. demonstrate, both theoretically experimentally,...

The photonic topological insulator has become an important research topic with a wide range of applications. Especially the higher-order insulator, which possesses gapped edge states and corner or hinge in gap, provides new scheme for control light hierarchy dimensions. In this paper, we propose heterostructure composed ordinary-topological-ordinary (OTO) crystal slabs. Two coupled (CESs) are generated due to coupling between ordinary-topological interfaces, opens up effective way...

The scattering matrix is the mathematical representation of characteristics any scatterer. Nevertheless, except for scatterers with high symmetry like spheres or cylinders, does not have analytical forms and thus can only be calculated numerically, which requires heavy computation. Here, we developed a well-trained deep neural network (DNN) that calculate without at speed thousands times faster than finite element solvers. Interestingly, obtained from DNN inherently satisfies fundamental...

Hyperuniformity provides a means of categorizing many nanostructures including nano-composite materials, and the design methodology based on hyperuniform randomness often leads to devices with extraordinary characteristics. In this work, we numerically experimentally demonstrate that Luneburg lens made disordered composite materials can dramatically reduce back scattering in comparison its counterpart periodic metamaterials. Two sample lenses scatterers distributions have been designed...

Previous reflectionless metasurfaces based on balanced electric and magnetic responses in engineered resonant meta-atoms become ineffective at oblique incident angles usually have strong reflection grazing incidence, where the impedance becomes near-zero or divergent. Here, by introducing concept of anomalous generalized Brewster effect to metasurfaces, we demonstrate an exceptional resonance-free metasurface that exhibits ultrabroadband zero incidence. The is obtained via combining...

Cladding layers of waveguides prevent interchannel interference yet are unfavorable for the integration photonic circuits. Here, we report realization ultracompact waveguide arrays, bends, and circuits with essentially zero separation. This supercompactness is achieved via arrays shifted spatial dispersions, where each functions as both transmission channel an effective "cladding layer" its neighboring waveguides, has been experimentally realized in low-loss all-dielectric crystals. We show...

Tunable acoustic metasurfaces have garnered substantial attention in recent years, offering an approach to manipulate waves efficiently. Despite the rapid progress this field, obtaining a dynamic metasurface with noncontact design remains challenging goal. Here, we theoretically propose and experimentally demonstrate designed using magnetic levitation. The meta-atom consists of cavity floating magnet. By varying magnitude current coil located at bottom cavity, position magnet can be...

Abstract An orbital angular momentum (OAM) carrying beam has the ability to detect a spinning surface from its rotational Doppler effect. However, mixture of linear and effects can occur when an OAM is illuminated target, with not only spins but also vibrations. In this paper, we experimentally observe using beams, both several designer surfaces. Specifically, polarization-independent metasurface, helicoidal reflector propeller are applied respectively in study. We demonstrate by use two...

We demonstrate the angular selection of incident electromagnetic waves using photonic crystals (PCs) composed a square lattice dielectric rods which exhibit position-varying Dirac conical dispersion at Brillouin zone boundary. At frequency point, transmittance can reach unity particular angle associated with dispersion, while for all other angles are reflected due to existence directional band gap. By changing size rods, position point boundary is variable, makes transmission customizable....

Abstract Focusing light into a tiny spot of high resolution is significant importance in fields from imaging, photolithography to microwave engineering and sensing. However, most the previous metalenses are constrained by their limited bandwidth efficiency. In this paper, on basis Mikaelian lens derived conformal transformation optics, rectangular gradient refractive index with relatively larger profile put forward manufactured isotropic dielectrics. Highly efficient (above 74%) broadband...

Abstract Dewdrops, the droplets of water naturally occurring on leaves and carapaces insects, are a fascinating phenomenon in nature. Here, man‐made array dewdrops with arbitrary shapes arrangements, which can function as an electromagnetic metasurface, is demonstrated. The realization dewdrop enabled by surface covered tailored pattern hydrophilic hydrophobic coatings, where tiny aggregate form former. Interestingly, this metasurface made be modulated condensation evaporation process. By...