Journal ArticleDOI
Direct calculation of permeability and permittivity for a left-handed metamaterial
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TLDR
In this article, an electromagnetic metamaterial was fabricated and demonstrated to exhibit a "left-handed" (LH) propagation band at microwave frequencies, a situation never observed in naturally occurring materials or composites.Abstract:
Recently, an electromagnetic metamaterial was fabricated and demonstrated to exhibit a “left-handed” (LH) propagation band at microwave frequencies. A LH metamaterial is one characterized by material constants—the permeability and permittivity—which are simultaneously negative, a situation never observed in naturally occurring materials or composites. While the presence of the propagation band was shown to be an inherent demonstration of left handedness, actual numerical values for the material constants were not obtained. In the present work, using appropriate averages to define the macroscopic fields, we extract quantitative values for the effective permeability and permittivity from finite-difference simulations using three different approaches.read more
Citations
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A Wideband Uniplanar Polarization Independent Left-Handed Metamaterial
TL;DR: In this paper, a simplified structure made of periodic array of cross cut-wire pairs (CCWPs), printed on only one side of a dielectric substrate, is introduced, which is responsive to arbitrarily linearly polarized incident waves, which supports both symmetric and antisymmetric resonance modes, offering a very wide double negative (DNG) passband with low losses.
Journal ArticleDOI
Issues in design of one-dimensional metamaterials for seismic protection
TL;DR: In this paper, the wave attenuation capability of one-dimensional binary seismic metamaterials was investigated analytically with different material combinations, and large contrasts in mass densities and wave velocities between the two constituent materials are desirable in consideration of gap width and central frequency.
Journal ArticleDOI
Quadratic solitons in media with negative refractive index
TL;DR: In this article, the authors considered the steady-state propagation of a solitary wave and of a nonlinear periodic (cnoidal) wave in a quadratically nonlinear medium, where the pump and its second harmonic are assumed to propagate in opposite directions.
Patent
Miniaturized antennas based on negative permittivity materials
TL;DR: In this article, an antenna comprises a resonator and a waveguide, which is conformed such that at the resonance, there is an efficient coupling between the resonance and the waveguide.
Journal ArticleDOI
Effective-medium properties of metamaterials: A quasimode theory
Shulin Sun,S. T. Chui,Lei Zhou +2 more
TL;DR: Under the generalized coherent-potential approximation, a "quasimode" theory is established to study the effective-medium properties of electromagnetic metamaterials and could provide quantitative judgments on how meaningful are the obtained effective- medium parameters.
References
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The Electrodynamics of Substances with Simultaneously Negative Values of ∊ and μ
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Magnetism from conductors and enhanced nonlinear phenomena
TL;DR: In this paper, it was shown that microstructures built from nonmagnetic conducting sheets exhibit an effective magnetic permeability /spl mu/sub eff/, which can be tuned to values not accessible in naturally occurring materials.
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Composite Medium with Simultaneously Negative Permeability and Permittivity
TL;DR: A composite medium, based on a periodic array of interspaced conducting nonmagnetic split ring resonators and continuous wires, that exhibits a frequency region in the microwave regime with simultaneously negative values of effective permeability and permittivity varepsilon(eff)(omega).
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Effective response functions for photonic bandgap materials
TL;DR: In this article, an effective description for a metalodielectric photonic bandgap (PBG) material was developed for a semi-infinite and slab observables.