It is found that there exist composite media exhibit strong spatial dispersion even in the very large wavelength limit. This follows from study of lattices ideally conducting parallel thin wires (wire media). In fact, our analysis reveals description this medium by means a local dispersive uniaxial dielectric tensor not complete, leading to unphysical results for propagation electromagnetic waves at any frequencies. Since non--local constitutive relations have been usually considered past as...

Abstract A model for a chiral material in which both the permittivity and permeability are equal to zero is discussed. Such referred by us as "chiral nihility". It shown that this exotic can be realized mixture of small helical inclusions. Wave solutions energy such medium analyzed. an extraordinary wave nihility backward wave. reflection refraction on interface also considered. linearly polarized normally incident onto produces "standing phase" same case oblique incidence causes two...

Approaches of automated evaluation electromagnetic material parameters have received a lot attention in the literature. Among others, one method is to retrieve from reflection and transmission measurements sample material. Compared other methods, this rather wideband method, but suffers an intrinsic limitation related electrical thickness measured In letter, we propose novel way overcome limitation. Although being based on classical Nicolson–Ross–Weir (NRW) technique, proposed extraction...

We study layered metal-dielectric structures, which can be considered as a simple example of nanostructured metamaterials. analyze the dispersion properties such structures and demonstrate that they show strong optical nonlocality due to excitation surface plasmon polaritons. derive model nonlocal effective medium for describing effects spatial in multilayered obtain analytical expressions components permittivity tensor depend on wave vector reveal exist both directions across along layers.

We suggest and verify experimentally the concept of functional metamaterials whose properties are remotely controlled by illuminating metamaterial with a pattern visible light. In such arbitrary gradients effective material parameters can be achieved simply adjusting profile illumination. fabricate light-tunable microwave demonstrate their unique functionalities for reflection, shaping, focusing electromagnetic waves.

Using our recently developed method we analyze the radiative heat transfer in micron-thick multilayer stacks of metamaterials with hyperbolic dispersion. The are especially designed for prospective thermophotovoltaic systems. We show that huge near-infrared thermal radiation across micron layers is achievable and can be optimized. suggest an approach to optimal design such taking into account high temperatures emitting medium heating photovoltaic by low-frequency part spectrum. both values...

Abstract In this Letter artificial media formed by dense arrays of parallel conducting wires are considered. A simple analytical model for the effective permittivity is derived from quasi‐static considerations. The result gives a formula in terms geometrical parameters and frequency. analysis covers lossy loaded as well. phenomena that lead to negative values discussed. © 2002 Wiley Periodicals, Inc. Microwave Opt Technol Lett 35: 47–51, 2002; Published online InterScience...

Abstract It is shown that thin mushroom layers (high‐impedance surfaces realized as regular arrays of small patches at a distance from metal surface) can be used radar‐absorbing structures whose performance does not change with the incidence angle for TM‐polarized waves. The key role vias connectors between and ground plane explained, potential demonstrated in examples. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 38: 175–178, 2003; Published online InterScience...

The effect of artificial magnetodielectric substrates on the impedance bandwidth properties microstrip antennas is discussed. We review results found in literature and then focus practically realizable magnetic media operating microwave regime. Next, a realistic dispersive behavior substrate embedded into model. It shown that frequency dispersion plays very important role characteristics loaded antenna. bandwidths reduced size patch with high-permittivity are compared. unlike dispersion-free...

A possible realization of isotropic artificial backward-wave materials is theoretically analyzed. An improved mixing rule for the effective permittivity a composite material consisting two sets resonant dielectric spheres in homogeneous background presented. The equations are validated using Mie theory and numerical simulations. effect statistical distribution sphere sizes on increase losses operating frequency band discussed some examples shown.

A simple quasi-static model applicable to a wide class of wire media is developed that explains strong non-locality in the dielectric response clear physical terms effective inductance and capacitance per unit length wire. The checked against known solutions found be excellent agreement with results obtained by much more sophisticated analytical numerical methods. Special attention given suppression spatial dispersion effects media.

New possibilities to design artificial magnetic materials for microwave frequencies are considered. Such composites can be used in engineering at where no natural lowloss available. A new particle (metasolenoid) formed by a stack of many parallel and very closely spaced single broken loops is proposed analyzed analytically, numerically, experimentally. It shown that the effective permeability reach reasonably high values over wide frequency range when using such inclusions.

We study the Cherenkov emission in vicinity of (or within) a nanowire metamaterial, and demonstrate that due to anomalously high density electromagnetic states such structures, it is possible boost by several orders magnitude as compared natural media, produce radiation with no threshold for velocity charged particles.

The concept of the perfect lens introduced by Pendry [Phys. Rev. Lett. 85, 3966 (2000)], i.e., a possibility to achieve optical resolution well below wavelength limit using backward wave (also called Veselago or double-negative) material slab lens, is reinvestigated. It shown that there direct analogy between phenomena taking place at interfaces and couple phase-conjugating planes placed in free space. Thus, this work introduces an alternative Pendry’s device. physics behind idea discussed...

It is shown that a system of two coupled planar material sheets possessing surface mode (polariton) resonances can be used for the purpose evanescent field restoration and, thus, sub-wavelength near-field imaging. The are placed in free space so they parallel and separated by certain distance. Due to interaction resonating modes (polaritons) an exponential growth amplitude plane wave coming through achieved. This effect was predicted earlier backward-wave (double-negative or Veselago) slab...

We generalize additional boundary conditions (ABCs) for wire media by including arbitrary junctions with impedance loading. Special attention is given to the at interface of two uniaxial metallic patches junction. The derived ABCs are validated against full-wave numerical simulations.

Here, we demonstrate that the power spectral density of thermal radiation at a specific wavelength produced by body finite dimensions set up in free space under fixed temperature could be made theoretically arbitrary high, if one realize double negative metamaterials with small loss and high absolute values permittivity permeability (at given frequency). This result refutes widespread belief Planck's law itself sets hard upper limit on emitted macroscopic whose size is much greater than...

Basic physical limitations on the material constitutive parameters of artificial passive materials with negative real parts effective are reviewed. It is shown that field solutions in hypothetical and nondispersive unstable. The energy density active metamaterials also considered

An isotropic three-dimensional flat lens of subwavelength resolution (“perfect lens”), based on the cubic meshes interconnected transmission lines and bulk loads is proposed. The formed by a slab loaded mesh placed between two similar unloaded meshes. dispersion equations characteristic impedances eigenwaves in are derived analytically, with an emphasis generality. This allows designing transmission-line desired properties. required backward-wave mode operation realized simple inductive...

Abstract We prove that, at any point of reciprocal structure, the local field intensity enhancement, which is averaged over incident wave polarizations and incidence directions, exactly coincides with radiative part Purcell factor, orientations emitter. This result important for gaining a better understanding electromagnetic Raman gain in surface-enhanced scattering further development this technique.

Higher order impedance boundary conditions designed for modeling wire grids of thin conducting wires are established. The derivation is based on the exact analytical summation individual fields. This allows one to write an approximate condition grid surface, which connects averaged electric field and current (or magnetic fields two sides surface). depends tangential derivatives (up sixth order). approach provides extension method (well established dense grids) sparse grids. Numerical...

We present a model of straight wire dipole scatterers loaded by arbitrary lumped loads in the center. These particles can be used as inclusions custom-design composite materials or electrically controllable metamaterials. The model, together with Clausius-Mossotti formula and an analytical for reflection transmission arrays, allows to find required realize desired electromagnetic properties estimate its realizability use various bulk loads.

Experimental evidence of the nonreciprocal Tellegen magnetoelectric effect is presented. The measured particle consists a small ferrite sphere and piece thin metal wire glued to sphere. whole system magnetized by permanent magnet. was observed experimentally when this positioned in rectangular waveguide excited loop. This result confirms direct observation microwave range known theoretical conclusions experimental evidences at low frequencies regarding mistakes some papers that claimed...

Design and experimental realization of a three-dimensional superlens based on LC-loaded transmission lines are presented. Commercially available components materials used in the design. Transmission properties designed structure studied experimentally observed lens compared with analytical predictions. Backward-wave propagation amplification evanescent waves prototype verified both analytically experimentally.