Journal ArticleDOI
Is there an experimental verification of a negative index of refraction yet
TLDR
It is shown that recent claims of experimental verification of a negative index of refraction in metallic metamaterials, "left-handed" microwave frequencies, are questionable and explained the transmittivities that were recently obtained.Abstract:
We show that recent claims of experimental verification of a negative index of refraction in metallic metamaterials, "left-handed" microwave frequencies, are questionable. At these frequencies the imaginary part of the dielectric permittivity is significant or even dominates its real part, and hence the effective medium behaves as a metal, i.e., with losses below the cutoff frequency of relevance. Then, the refractive index is complex, and there is not a distinction between right- and left-handed material because the electromagnetic wave is inhomogeneous. Just by using this idea we explain the transmittivities that were recently obtained in experiments by Shelby et al. [Science 292, 77 (2001) and Appl. Phys. Lett. 78, 489 (2001)].read more
Citations
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Physics of negative refractive index materials
TL;DR: In this paper, the authors review the fundamental concepts and ideas of negative refractive index materials and present the ideas of meta-materials that enable the design of new materials with a negative dielectric permittivity, negative magnetic permeability, and negative fringes.
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Experimental observations of a left-handed material that obeys Snell's law.
TL;DR: 2D measurements of collimated microwave beams transmitted through composite wire and split-ring resonator prisms demonstrate that transmission obeys Snell's law with a negative index, confirming the refractive nature of this signal and refuting alternatives posed in the criticisms.
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Subwavelength imaging in photonic crystals
TL;DR: In this paper, the authors investigate the transmission of evanescent waves through a slab of photonic crystal and explore the recently suggested possibility of focusing light with subwavelength resolution, and they find that the periodicity of the photonic lattice imposes an upper cutoff to the transverse wave vector of evanecent waves that can be amplified, and thus a photonic-crystal superlens is free of divergences even in the lossless case.
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Negative refractive index metamaterials
TL;DR: In this article, a negative refractive index property is found in metamaterials that exhibit exotic and unique electromagnetic properties not inherent in the individual constituent components. But, the negative index is not found in any known naturally occurring material.
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Negative refraction in indefinite media
TL;DR: In this article, a detailed analysis of the refraction and reflection behavior of electromagnetic waves at an interface between an indefinite medium and vacuum is presented, and it is shown that certain classes of indefinite media have identical refractive properties as isotropic negative index materials.
References
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The Electrodynamics of Substances with Simultaneously Negative Values of ∊ and μ
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Experimental Verification of a Negative Index of Refraction
TL;DR: These experiments directly confirm the predictions of Maxwell's equations that n is given by the negative square root ofɛ·μ for the frequencies where both the permittivity and the permeability are negative.
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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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Microwave transmission through a two-dimensional, isotropic, left-handed metamaterial
TL;DR: In this paper, the authors present experimental data, numerical simulations, and analytical transfer-matrix calculations for a two-dimensional isotropic, left-handed metamaterial (LHM) at X-band microwave frequencies.