منابع مشابه
Negative refraction, negative phase velocity, and counterposition
The planewave response of a linear passive material generally cannot be characterized by a single scalar refractive index, as directionality of energy flow and multiple wavevectors may need to be considered. This is especially significant for materials which support negative refraction, negative phase velocity, and counterposition. By means of a numerical example based on a commonly studied bia...
متن کاملNegative refraction in indefinite media
Initial experiments on wedge samples composed of isotropic metamaterials with simultaneously negative permittivity and permeability have indicated that electromagnetic radiation can be negatively refracted. In more recently reported experiments [Phys. Rev. Lett. 90, 1074011 (2003)], indefinite metamaterial samples, for which the permittivity and permeability tensors are negative along only cert...
متن کاملFocusing light using negative refraction
A slab of negatively refracting material, thickness d , can focus an image at a distance 2d from the object. The negative slab cancels an equal thickness of positive space. This result is a special case of a much wider class of focusing: any medium can be optically cancelled by an equal thickness of material constructed to be an inverted mirror image of the medium, with ε, μ reversed in sign. W...
متن کاملPerfect antireflection via negative refraction
We suggest a geometrical framework to discuss the action of slabs of negatively refracting materials. We show that these slabs generate the same orbits as normal materials, but traced out in opposite directions. This property allows us to confirm that the action of any lossless multilayer can be optically cancelled by putting it together with the multilayer constructed as the inverted mirror im...
متن کاملPerfect imaging without negative refraction
Perfect imaging has been believed to rely on negative refraction, but here we show that an ordinary positively–refracting optical medium may form perfect images as well. In particular, we establish a mathematical proof that Maxwell’s fish eye in two–dimensional integrated optics makes a perfect instrument with a resolution not limited by the wavelength of light. We also show how to modify the f...
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ژورنال
عنوان ژورنال: Nature Photonics
سال: 2017
ISSN: 1749-4885,1749-4893
DOI: 10.1038/nphoton.2017.130