In this paper, we have studied a practical design of broadband linear-to-circular polarizer based on self-complementary metasurface composed zigzag-shaped metal strips printed dielectric substrate. The term indicates that the structure is identical to its complement, except for some translation smaller than periodicity. This property together with nonresonant response unit cells ensures conversion from linear polarization circular polarization. Although experimentally achieved relative...

In this work, we have demonstrated that self-complementary metasurfaces can provide linear-to-circular polarization conversion. For illustration of general approach, studied several particular structures based on periodic patterns etched metal sheets negligible thickness. The advantage using over previous proposals thin polarizers is the rigorous constancy phase difference between transmission (or reflection) coefficients corresponding to orthogonal linear polarizations, which just...

The Purcell effect is usually described as a modification of the spontaneous decay rate in presence resonator. In plasmonics, this commonly associated with large local-field enhancement “hot spots” due to excitation surface plasmons. However, high-index dielectric nanostructures, which become basis all-dielectric nanophotonics, cannot provide high values larger radiation losses. Here, we demonstrate how achieve strong and show theoretically that factor can be increased by two orders...

Magnetic resonance imaging (MRI) is one of the most important noninvasive techniques for human diagnostic medicine. Over decades MRI quality has improved substantially, through design very sensitive multichannel receivers, but designs based on conventional materials are nearly topped out in terms performance. Thus artificial sought to further boost sensitivity. The authors demonstrate a type metasurface that can dramatically enhance image quality, allowing resolution smaller features tumors,...

Reconfigurable intelligent surfaces (RISs) are promising and relatively low-cost tools for improving signal propagation in wireless communications. A RIS assists a base station (BS) optimizing the channel maximizing its capacity by dynamically manipulating reflected field. Typically, RISs based on reconfigurable reflectarrays (RAs), i.e., 2-D arrays of passive patch antennas, individually switchable between two or more reflection phases. The spatial resolution provided field patterns is...

Purpose Design and characterization of a new inductively driven wireless coil (WLC) for wrist imaging at 1.5 T with high homogeneity operating due to focusing the B 1 field birdcage body coil. Methods The WLC design has been proposed based on volumetric self‐resonant periodic structure coupled split‐loop resonators structural capacitance. was optimized studied regarding radiofrequency fields interaction (BC) by electromagnetic simulations. manufactured characterized on‐bench measurements in...

High-permittivity dielectric pads, i.e., thin, flexible slabs, usually consisting of mixed ceramic powders and liquids, have been previously shown to increase the magnetic field at high ultra high-fields in regions low efficiency transmit coils, thus improving homogeneity images. However, their material parameters can change with time, some materials they contain are bio incompatible. This article presents an alternative approach replacing mixtures a low-cost stable artificial slab. The...

Recently, a special class of Huygens' surfaces has been proposed which are capable manipulation transmitted wavefronts while exhibiting high transparency over broad range frequencies. In this work we propose and study new meta-atom for achieving broadband based on two mutually shifted split-ring resonators. The resonators were carefully optimized using developed analytical model so that their electric magnetic responses was balanced to achieve unidirectional scattering the incident field....

Abstract In this paper, we propose, design and test a new dual-nuclei RF-coil inspired by wire metamaterial structures. The coil operates as result of resonant excitation hybridized eigenmodes in multimode flat periodic structures comprising several coupled thin metal strips. It was shown that the field distribution (i.e. penetration depth) can be controlled independently at two different Larmor frequencies selecting proper eigenmode each mutually orthogonal proposed requires no lumped...

In this letter, we describe and study microwave Luneburg lenses using a broadband metamaterial composed of radially diverging dielectric rods. The gradual Luneburg's permittivity profile is achieved in lens through arranging identical thin rods with spatially variable cross section various radial directions subwavelength separation. performance the considered was studied by full-wave numerical simulation measurements an anechoic chamber. results reveal that, although anisotropy structure...

Hyperbolic metasurfaces have gained significant attention due to their extraordinary electromagnetic properties control propagating plane waves, but the excitation and propagation of surface plasmon-polaritons at hyperbolic metasurfaces, called plasmons, been experimentally observed just recently. However, advantages such as hybrid TE-TM polarization discussed below, are not yet fully revealed analyzed. In this paper we focus on numerical experimental characterization waves in frequency...

Wireless power transfer is a breakthrough technology which can be used in all aspects of humans daily life. Here, bi-layer metasurface as transmitter for near-field wireless proposed and studied. The novelty advantage the spatial separation electric magnetic near fields. Magnetic fields responsible are sufficiently high on top whereas almost completely confined between two layers metasurface. These unique properties have been obtained due to special design based orthogonal resonant wires...

Metasurfaces provide a broad range of functionalities related to wavefront manipulation in different frequency ranges with the advantage subwavelength thickness. In this work, we numerically and experimentally investigate terahertz splitter circularly polarized beams based on spatially nonuniform metasurface composed self-complementary unit cells. When illuminated circular polarization, creates deflected cross-polarized beam while transmitting co-polarized normal direction. Despite existence...

A new platform for routing surface electromagnetic waves does so efficiently across a planar while maintaining control of polarization, key steps toward the realization flat optical devices.

We study the light scattering by plasmonic and dielectric symmetric trimers to investigate existence of polarization-independent Fano resonances. Plasmonic hybridization theory is revealed hide simple physics, we instead provide a simplified model for derive trimer's eigenmodes analytically. This approach demonstrated accurately recreate full wave simulations their are subsequently able deduce grounds modal interference in related formation However, generalizing our approach, also...

Metasurfaces is a rapidly developing area with quite many prospective applications in light manipulation, aberration‐free optical imaging, and security. One potential where metasurface approaches may provide valuable contribution medical imaging. In this paper, novel subwavelength metasurface‐inspired resonator design presented, which employed to enhance the sensitivity of magnetic resonance imaging (MRI). To end, formed by an array capacitively loaded telescopic wires placed inside scanner...

Radiofrequency field inhomogeneity is a significant issue in imaging large fields of view high- and ultrahigh-field MRI. Passive shimming with coupled coils or dielectric pads the most common approach at 3 T. We introduce test light compact metasurface, providing same homogeneity improvement clinical abdominal T as conventional pad. The metasurface comprising periodic structure copper strips parallel-plate capacitive elements printed on flexible polyimide substrate supports propagation slow...

In this letter, we study the possibility to achieve perfect absorption of TM-polarized plane electromagnetic waves for two incidence angles at same frequency. The effect was obtained in a high-impedance surface (HIS) also called mushroom metasurface due combination types dissipation losses inside each unit cell HIS, dielectric losses, and resistance lumped loads. dual-angle is narrowband resonance effect. It shown analytically that one can completely suppress reflection predefined incidence....