Showing papers on "Transformation optics published in 2002"

Experimental verification of backward-wave radiation from a negative refractive index metamaterial

Abstract: A composite medium consisting of an array of fine wires and split-ring resonators has been previously used to experimentally verify a negative index of refraction. We present a negative refractive index (NRI) metamaterial that goes beyond the original split-ring resonator/wire medium and is capable of supporting a backward cone of radiation. We report experimental results at microwave frequencies that demonstrate backward-wave radiation from a NRI metamaterial—a characteristic analogous to reversed Cherenkov radiation. The conception of this metamaterial is based on a fresh perspective regarding the operation of NRI metamaterials.

Advances in electromagnetics of complex media and metamaterials

Abstract: I. General Aspects of Complex Media and Metamaterials.- Electromagnetic Emergence in Metamaterials. Deconstruction of Terminology of Complex Media.- Ideas for Potential Applications of Metamaterials with Negative Permittivity and Permeability.- Frequency Response Engineering of Magnetic Composite Materials.- A Flavour of Constitutive Relations: The Linear Regime.- II. Metamaterials With Negative Parameters.- Electrodynamics of Media with Simultaneously Negative Electric Permittivity and Magnetic Permeability.- Modelling and Microwave Properties of Artificial Materials with Negative Parameters.- On the Electromagnetic Modelling of Left-Handed Metamaterials.- III. Photonic Band Gap Materials.- Controllable Semiconductor Photonic Band Gap Structures.- Photonic Band Gap Effects in Magnetic Film with Periodically Striped-Domain Structure.- Simulation of Finite Photonic Crystals made of Biisotropic or Chiral Material. Using the Method of Auxiliary Sources.- IV. Analysis And Modelling Of Bianisotropic Structures.- Propagation of Electromagnetic Waves in Artificial Anisotropie Uniform and Twisted Omega-Structures.- A Review of Homogenization Studies for Biaxial Bianisotropic Materials.- Dispersion Properties of Stop-Band Structures from Thin Metallic Spirals.- Effective Electron Model of the Wire Helix Excitation at Microwaves: First Step to Optimization of Pitch Angle of Helix.- V. Advanced Computational Methods For Electromagnetic Waves Interaction With Metamaterials.- Transmission and Reflection of Electromagnetic Waves by the Plane Stratified Structures Possessing Gyrotropic Properties.- Selective Reflection at an Oblique Incidence of Electromagnetic Waves onto Stratified Periodic Gyrotropic Structures.- Resonances of Closed Modes in Thin Arrays of Complex Particles.- Surface and Leaky Modes of Multilayered Omega Structures.- The Competition of Bragg Reflection and Fresnel's Reflection of Electromagnetic Waves in the Artificial Helicoidal Bianisotropic Media with Local Chirality.- Use of Contemporary Mathematical Applications for Exact Solution of Light Propagation Problem in Layered Media. Propagation and Scattering.- VI. Heterogeneous Materials and Wave Localization.- On Electrodynamics of One-Dimensional Heterogeneous System Beyond Homogenization Approximation.- Localized Electromagnetic and Elastic Fields with Applications to Control Laser Radiation.- Excitonic Composites.- Optical Anisotropy of the Crystals at the Nonuniform Fields.- VII. Applications of Complex Media and Other Metamaterials.- Self-Adaptive Material Systems.- Electromagnetic Field Solution in Curved Structures with Local Bianisotropic Loading Media.- Dielectric Substrates Anisotropy Effects on the Characteristics of Microstrip Structures.- Theoretical and Experimental Limitations of Chiral Microwave Absorbers.- List of Contributors.

Electromagnetics of complex media and metamaterials

Abstract: An overview of the electromagnetic properties of complex media and metamaterials, particularly metamaterials with negative real permittivity and permeability, is given and various ideas for potential applications of these materials will be presented.

Numerical studies of left handed metamaterials: Abstract

Abstract: We use the three dimensional Finite Difference Time Domain (FDTD) technique to study metamaterials exhibiting both negative permittivity and permeability in certain frequency bands. The structure under study is the well-known periodic arrangement of rods and split-ring resonators, previously used in experimental setups. The three parameters we study are the transmission coefficient of a slab, the phase variation of the propagating fields within the metamaterial, and the refraction of a wave through a prism. To our knowledge, this is the first time that the last two parameters are studied rigorously using a numerical method. The results of this work show that fields propagating inside the metamaterial with a forward power direction exhibit a backward phase velocity and negative index of refraction.

Interacting Magnetic Resonators for Left-Handed Metamaterials

Abstract: We study experimentally and numerically the electromagnetic resonances in split ring resonators S(SRRs), around 1GHz. For an individual anisotropic SRR, we show that both electric and magnetic fields can induce resonances, the magnetic one being the strongest. This behaviour leads to an anisotropic response of the SRR, which depends on the illumination direction. The coupling between two or more SRRs can be quite complex and strongly depends on their geometrical arrangement. Finally we propose and study an alternative magnetic resonant structure with a higher degree of isotropy.