We propose an improved method to retrieve the effective constitutive parameters (permittivity and permeability) of a slab metamaterial from measurement S parameters. Improvements over existing methods include determination first boundary thickness slab, selection correct sign impedance, mathematical choose branch real part refractive index. The sensitivity accuracy is also discussed. has been applied various metamaterials successful retrieval results prove its effectiveness robustness.

We establish analytically the interactions of electromagnetic wave with a general class spherical cloaks based on full Mie scattering model. show that for an ideal cloak total cross section is absolutely zero, but specific type loss, only backscattering exactly which indicates can still be rendered invisible monostatic (transmitter and receiver in same location) detection. Furthermore, we imperfect parameters bistatic different locations) performance more sensitive to eta(t)=square root...

We propose a method to retrieve the effective constitutive parameters of slab bianisotropic metamaterial composed split-ring resonators from measurement S parameters. Analytical inversion equations are derived for homogeneous loss-less media, and numerical retrieval approach is presented case lossy media. The verified both analytically numerically, it shown that results various resonator metamaterials qualitatively corroborate conclusions found in published papers. proposed can be used as...

By using a phased electromagnetic dipole array to model moving charged particle, we experimentally verified reversed Cherenkov radiation in the left-handed media frequency range from 8.1 9.5 GHz. Our results demonstrate feasibility of new types particle detectors and generators.

The guidance conditions of modes with both real and imaginary transverse wave numbers inside a dielectric slab negative permittivity permeability are solved. We show that for numbers, cutoffs exist all modes, unlike in conventional media where the first even mode is always propagating. In addition, we also guided power concentrated at interfaces instead having maxima slab. A graphical method determining introduced which clearly identifies different propagation depending on properties...

A junction for single-photon detection Josephson junctions are simple superconducting devices comprising an insulator or semiconductor separating two regions. They form the workhorse of technologies and exquisitely sensitive to magnetic field. One long-sought proposal has been use these detect light. Walsh et al. have realized a photosensitive based on graphene that is capable sensing single infrared photons. Such expected operate as high-speed, low-power consumption optical interconnect...

We study transmission at a boundary between right-handed medium (RHM: epsilon>0, mu>0) and frequency dispersive left-handed [LHM: epsilon(omega)<0, mu(omega)<0 for some omega], both homogeneous isotropic. In order to account the dispersion, two types of signal spectra are considered. The first consists discrete frequencies, while second is Gaussian. Explicit expressions time-domain fields obtained, from which time-averaged Poynting vectors hence power flow calculated. cases, we find that...

The mathematical solution for Cerenkov radiation in a novel medium, left-handed medium (LH medium), which has both negative permittivity and permeability, is introduced this paper. It shown that the particle motion LH generates power propagates backward. In paper, dispersion dissipation are considered medium. results show such material, forward backward exist. addition, we losses will affect angle. idea of building detector using introduced, could be useful physics to identify charged...

A unique negative lateral shift is demonstrated in this letter for a Gaussian beam reflected from grounded slab with both permittivity and permeability, which distinctly different caused by regular slab. The incident modeled as tapered wave spectrum. waves inside outside the are solved analytically Maxwell’s equations matching boundary conditions at interfaces. It shown that field values all regions can be unambiguously determined. Numerical simulations presented well power densities...

Based on electromagnetic wave scattering theory, we demonstrate that magnetic and electric surface currents are induced at the inner boundary of a cylindrical cloak by incoming waves. These have no counterparts in coordinate transform theory. In addition, fields can penetrate into concealed region under specified conditions, but carry power. The field distribution be unsymmetrical when circularly polarized is obliquely incident onto cloak. far-field for nonideal also theoretically addressed.

The coordinate transformation by using form-invariant transformations of Maxwell equations has led to an approach for designing devices with anisotropic metamaterial. In this paper, we present the design methodology a low profile planar focusing antenna based on parabolic antenna. electromagnetic behavior is simulated two-dimensional finite element method and results show that same performances as technology provides alternative conventional antennas.

A one-directional invisibility cloak is presented in this letter. Perfect can be achieved for TM waves along certain directions. The parameters are just homogeneously anisotropic and relatively easy practical realizations. Nonmagnetic also studied to further reducing the complexity of parameters. Thin layered systems with alternating isotropic materials then designed model such kind cloaks.

The electromagnetic field solution for a spherical invisibility cloak with an active device inside is established. Extraordinary electric and magnetic surface voltages are induced at the inner boundary of cloak, which prevent waves from going out. phase handness polarized obliquely incident on such boundaries kept in reflected waves. due to dipole concealed region found equal auxiliary scalar potentials boundary, consequently gain physical counterparts this case.

We examine the effectiveness of ground-plane invisibility cloak generated from quasiconformal mapping electromagnetic space. This without anisotropy will generally lead to a lateral shift scattered wave, whose value is comparable height cloaked object, making object detectable. can be explained by fact that corresponding virtual space thinner and wider than it should be. Ray tracing on concrete model shows for bump with maximum 0.2 units hidden, ray 45 degree incidence around 0.15 units.

The electromagnetic characteristics of plane-transformed invisibility cloaks are quantitatively studied in this paper.We take elliptical cylindrical cloak as the example, and use an wave expansion method to obtain scattered field.It is demonstrated that ideal inherently visible.Noticeable field scattering penetration will be induced when exposed directly wave.However, long consists a perfect electric conducting lining at interior surface, can still achieved along direction parallel major...

A controllable left-handed metamaterial based on a varactor-loaded S-shaped resonator structure is presented to realize an active radome. By controlling the phase properties of radome, antenna exhibits continuous scanning capability in range ±40°, which confirmed by theoretical analysis.

We reviewed the recent progress in left-handed materials with simultaneously negative permittivity and permeability. Attention has been given to fundamental electromagnetic properties material, metamaterial designs, applications, homogenization methods.

We apply coordinate transformations in the design of waveguides with bent geometry to reduce reflection at incident port. It was found that case metallic waveguides, by applying transformation medium inside a right-angle waveguide, low can be obtained. For dielectric this also done same region containing both core and its claddings. Our proposed technique provides an alternative method for designing insertion loss.

We show in this paper that metamaterials which some components of the permittivity and permeability tensors can have negative real values (thus associated with left-handed metamaterials) call for a reconsideration common concepts critical angle Brewster angle.By studying reflection coefficient isotropic biaxial half-spaces slabs, we metamaterial appears beyond is realizable.In addition, also Goos-Hänchen shift induced by lefthanded slabs not necessarily but could be positive when second...

The refraction of phase and power at the interface between free space anisotropic media is studied. Under a TE incidence (electric field along y/spl circ/) k/sub y/=0 (where y/ circ/ component wave vector), closed-form generalization Snell's laws proposed. two relations (one for one power) are expressed in terms incident angle, constitutive parameters medium (which can take negative values), tilting angle dispersion relation. In addition, both positive dispersions discussed, making formulas...

We use coordinate transformation theory to realize substrates that can modify the emission of an embedded source.Simulation results show with proper functions energy radiated by a source in these space variant media will be concentrated narrow beam.The thickness slab achieved our transformations no longer restricted evanescent modes and placed at any position along boundary substrate without affecting radiation pattern.We also discuss case where reduced parameters are used, which still...

We theoretically study reversed Cherenkov radiation (CR) in anisotropic double-negative metamaterials (DNMs) general, and particularly detail for one of the most practical cases, i.e., CR a waveguide partially filled with DNMs. The theory presented here provides theoretical basis possible experiments potential applications. As an example, we discuss physical properties applications such as particle detectors high-power sources.