Journal ArticleDOI
Multifocal flat lens with left-handed metamaterial
TLDR
In this paper, the authors demonstrate multiple focal lengths at microwave frequencies in a flat lens constructed of a left-handed metamaterial (LHM) with a negative effective index of refraction.Abstract:
We show experimental results demonstrating multiple focal lengths at microwave frequencies in a flat lens constructed of left-handed metamaterial (LHM). In contrast to conventional lenses, which are constructed of materials with positive index and require a curved surface or inhomogeneous structures to focus light or other electromagnetic radiation, no curvature is needed with a LHM because of a negative effective index of refraction. Such a flat lens has the advantage of being capable of changing the focal length by simply changing the distance between the electromagnetic source and the lens.read more
Citations
More filters
Journal ArticleDOI
Contemporary notes on metamaterials
TL;DR: The essence of the metamaterial concept from the structural point of view is described and the corresponding requirements and precautions for using that concept are pointed out.
Journal ArticleDOI
Focusing of electromagnetic waves by a left-handed metamaterial flat lens.
TL;DR: The experimental results from research conducted on negative refraction and focusing by a two-dimensional (2D) left-handed metamaterial (LHM) slab are presented, finding an effective refractive index of -1.86.
Journal ArticleDOI
Metamaterial based telemetric strain sensing in different materials
TL;DR: This work presents telemetric sensing of surface strains on different industrial materials using split-ring-resonator based metamaterials and demonstrates that hard material (cast polyamide) showed low slope in frequency shift vs. applied load, while soft material (polyamide) exhibited high slope (low Young's modulus).
Journal ArticleDOI
Electromagnetic wave focusing from sources inside a two-dimensional left-handed material superlens
TL;DR: In this paper, left-handed materials (LHM) were employed as negative index materials and experimentally investigated the focusing behavior of such lenses. But the focusing effect occurred at the surface of the LHM with a spot size of 0.16λ.
Proceedings ArticleDOI
Using COMSOL Multiphysics software to model anisotropic dielectric and metamaterial effects in folded-waveguide traveling-wave tube slow-wave circuits
TL;DR: In this article, the electromagnetic effects of conventional dielectrics, anisotropic dielectric, and metamaterials were modelled in a terahertz-frequency folded-waveguide slow-wave circuit.
References
More filters
Journal ArticleDOI
Negative Refraction Makes a Perfect Lens
TL;DR: The authors' simulations show that a version of the lens operating at the frequency of visible light can be realized in the form of a thin slab of silver, which resolves objects only a few nanometers across.
Journal ArticleDOI
The Electrodynamics of Substances with Simultaneously Negative Values of ∊ and μ
Journal ArticleDOI
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.
Journal ArticleDOI
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.
Journal ArticleDOI
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).