The electromagnetic theory of diffraction and the Babinet principle are applied to design artificial metasurfaces metamaterials. A new particle, complementary split rings resonator, is proposed for with high frequency selectivity planar metamaterials a negative dielectric permittivity. Applications in fields selective surfaces polarizers, as well microwave antennas filter design, can be envisaged. tunability all these devices by an dc voltage also achievable if particles etched on...

Abstract The terahertz (THz) band has very attractive characteristics for sensing and biosensing applications, due to some interesting features such as being a non‐ionizing radiation, sensitive weak interactions, thus, complementing typical spectroscopy systems in the infrared. However, fundamental drawback is its relatively long wavelength (10–1000 µm) which makes it blind small features, hindering seriously both thin‐film biological sensing. Recently, new ways overcome this limitation have...

We explore, both experimentally and theoretically, the existence in millimeter-wave range of phenomenon extraordinary light transmission through arrays subwavelength holes. have measured spectra several samples made on aluminum wafers by use an AB Millimetre quasi-optical vector network analyzer wavelength 4.2–6.5 mm. Clear signals resonant at wavelengths close to period array appear spectra.

A complementary split ring resonator (CSRR)-based metallic layer is proposed as a route to mimic surface plasmon polaritons.A numerical analysis of the textured carried out and compared previous prominent topologies such metal mesh, slit array, hole Sievenpiper mushroom surfaces, which are studied well from transmission line perspective.These well-documented geometries suffer narrowband response, alongside, in most cases, thickness constraint (usually order λ/4) non-subwavelength modal size...

In this work we present the concept and design of an ultrathin (\ensuremath{\lambda}/22) terahertz (THz) unidirectional carpet cloak based on local phase compensation approach enabled by gradient metasurfaces. A triangular surface bump with center height 4.1 mm (1.1\ensuremath{\lambda}) tilt angle 20\ifmmode^\circ\else\textdegree\fi{} is covered a metasurface composed array suitably designed closed ring resonators transverse impedance. The provide wide range control for reflection small...

The capability of generating terajets using three-dimensional (3D) dielectric cuboids working at terahertz (THZ) frequencies (as analogues nanojets in the infrared band) is introduced and studied numerically. focusing performance evaluated terms transversal full width half maximum (FWHM) along x- y-directions different refractive indices for a 3D cuboid with fixed geometry, obtaining quasi-symmetric terajet subwavelength resolution ∼0.46λ0 when index n = 1.41. Moreover, backscattering...

A metasurface carpet cloak for millimeter-wave range with polarization-independent performance is experimentally demonstrated. It shown that the able to mimic ground plane by fully restoring amplitude and phase distributions both transverse electric magnetic polarizations, a relatively wide frequency angular widths response. As service our authors readers, this journal provides supporting information supplied authors. Such materials are peer reviewed may be re-organized online delivery, but...

Metamaterial structures are artificial materials that show unconventional electromagnetic properties such as photonic band-gap, extraordinary optical transmission and left-handed propagation.Up to now, relations of crystals negative refraction have been shown well sub-wavelength hole arrays.Here we report a metamaterial engineered by combination array plates periodically stacked form crystal structure.It is the possibility fine-tuning in order permit behaviour.Our work demonstrates...

Plasmonic nanoantennas provide new routes for efficiently detecting, analyzing, and monitoring single biomolecules via fluorescence, Raman, infrared absorption spectroscopies. The development of efficient biosensors multispectral spectroscopy remains nevertheless limited by the narrowband responses plasmonic devices, as they are generally designed to operate in a specific bandwidth, matching with absorption, scattering, or emission frequency target under investigation. Therefore, performing...

The THz frequency band is in many respects the next technological frontier for ultrafast, broadband wireless communication and ultrasensitive biosensing. Challenging goals these fields demand fresh approaches electromagnetism research, such as metamaterials. This paper presents an...

Abstract In this paper we perform an in-depth theoretical study of a sensing platform based on epsilon-near-zero (ENZ) metamaterials. The structure proposed for is narrow metallic waveguide channel. An equivalent circuit model rigorously deduced using transmission line theory, considering several configurations dielectric body (analyte sample) inserted within the channel, showing good agreement with results obtained from numerical simulations. able to reproduce even most peculiar details...

Scientists and laymen alike have always been fascinated by the ability of lenses mirrors to control light. Now, with advent metamaterials their two-dimensional counterpart metasurfaces, such components can be miniaturized designed additional functionalities, holding promise for system integration. To demonstrate this potential, here ultrathin reflection metasurfaces (also called metamirrors) focusing terahertz radiation into a single spot four spaced spots are proposed experimentally...

In the past, it has been demonstrated that is possible to produce terajets with high resolution at its focus using 3D dielectric cuboids under plane-wave illumination. Here, a systematic study of harmonic and angular response performed. Mutifrequency focusing fundamental frequency two higher harmonics showing an intensity enhancement ∼10, ∼18, ∼14 for each case. This capability use first experimentally evaluated sub-THz frequencies, good agreement numerical results. Moreover, robust...

A photonic jet (terajet at THz frequencies) commonly denotes a specific spatially localized region in the near-field front side of dielectric particle with diameter comparable wavelength illuminated plane wave from its backside (i.e., emerges shadow surface particle). In this paper formation is demonstrated using recently proposed 3D cuboids working reflection mode when towards direction incidence wavefront. The results simulations based on Finite Integration Technique are discussed. All...

In this letter, a very low-profile planar horn antenna is proposed. It consists of subwavelength aperture placed into "Bull's Eye" concentric periodic corrugated conducting plate that produces good return losses and narrow radiated beam. The excited by means waveguide whose flange has been properly mechanized in the rear part structure. mechanism explaining phenomenon similar to enhanced transmission observed at optical wavelengths structures. work, circularly structure scaled microwave...

In this paper, we show that the phenomenon of extraordinary transmission through arrays subwavelength holes, present in optical regime, is also millimeter wave range. After presentation theoretical foundations enhanced transmission, measurements response have been performed on different samples by using a quasioptical vector network analyzer range between 45 and 110 GHz. The prototypes fabricated Aluminum plates with several thickness hole diameters drilled laser machine. Good agreement...

A novel periodic structure, made of an arbitrary number stacked subwavelength hole arrays, exhibiting simultaneously electromagnetic band gap, extraordinary transmission and a longitudinal left handed propagation is presented in this paper. If the period structure chosen adequately, it possible under normal incidence to mold wave properties inside from right-handed left-handed passing through zero-group velocity band. The response fabricated prototype has been measured with millimeter...

Metamaterial structures are artificial materials that show unconventional electromagnetic properties such as negative refraction index, perfect lenses, and invisibility. However, losses one of the big challenges to be surpassed in order design practical devices at optical wavelengths. Here we report a prism engineered by stacked sub-wavelength hole arrays. These exhibit inherently an extraordinary transmission which could offer solution problem It is shown possibility obtain indices starting...

An epsilon-near-zero graded-index converging lens with planar faces is proposed and analyzed.Each perfectly-electric conducting (PEC) waveguide comprising the operates slightly above its cut-off frequency has same length but different cross-sectional dimensions.This allows controlling individually propagation constant normalized characteristic impedance of each for desired phase front at output while Fresnel reflection losses are minimized.A complete theoretical analysis based on theory...

An all-metallic steerable beam antenna composed of an ε-near-zero (ENZ) metamaterial lens is experimentally demonstrated at 144 GHz (λ0 = 2.083 mm). The ENZ realized by array narrow hollow rectangular waveguides working just near and above the cut-off TE10 mode. focal arc on xz-plane initially estimated analytically as well numerically compared with experimental results demonstrating good agreement. Next, a flange-ended WR-6.5 waveguide placed along to evaluate ENZ-lens steerability. A gain...

The performance of an epsilon-near zero (ENZ) plano-concave lens is experimentally demonstrated and verified at the D-band millimeter-waves. comprised array narrow metallic waveguides near cut-off frequency, which effectively behaves as epsilon-near-zero medium 144 GHz. A good matching with free space achieved by exploiting phenomenon energy squeezing a clear focus transmission enhancement 15.9 dB measured. shows radiation properties directivity 17.6 dBi low cross-polar components -34 dB....

This article presents the design of a flat Luneburg metalens antenna at V-band using gap waveguide (GW) technology. The consists parallel plate (PPW) loaded with metallic pins whose height is modulated to get an effective refractive index that follows equation. A Groove GW (GGW) H-plane horn used illuminate metalens, such rays are collimated and planar wavefront generated in direction propagation. Since structure hand planar, it can be efficiently integrated on surfaces. Moreover, fully...

Electronductive waves supported by chains of resonators drilled on a metallic plate are presented. Propagation energy comes as consequence the electric coupling between these resonators. Therefore, termed electroinductive waves. They can be interpreted dual counterpart so-called magnetoinductive waves, which due to mutual inductances along In order show their existence, some electromagnetic simulations and experiments have been carried out, using complementary particle split ring resonator....