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Negative-index metamaterial or negative-index material (NIM) is a metamaterial whose refractive index for an electromagnetic wave has a negative value over some frequency range. [ 1 ] NIMs are constructed of periodic basic parts called unit cells , which are usually significantly smaller than the wavelength of the externally applied ...
Negative index metamaterials behave contrary to the conventional "right-handed" interaction of light found in conventional optical materials. Hence, these are dubbed left-handed materials or negative index materials (NIMs), among other nomenclatures. [5] [21] [22] Only fabricated NIMs exhibit this capability.
Other terms for NIMs include "left-handed media", "media with a negative refractive index", and "backward-wave media". [3] NIMs where the negative index of refraction arises from simultaneously negative permittivity and negative permeability are also known as double negative metamaterials or double negative materials (DNG). [21]
Optical properties can be expanded beyond the capabilities of lenses, mirrors, and other conventional materials. One of the effects most studied is the negative index of refraction first proposed by Victor Veselago in 1967. Negative index materials, exhibit optical properties opposite to those of glass, air, and the other conventional materials ...
Negative refraction can be obtained by using a metamaterial which has been designed to achieve a negative value for electric permittivity (ε) and magnetic permeability (μ); in such cases the material can be assigned a negative refractive index. Such materials are sometimes called "double negative" materials. [1]
There are also weaker dependencies on temperature, pressure/stress, etc., as well on precise material compositions (presence of dopants, etc.); for many materials and typical conditions, however, these variations are at the percent level or less. Thus, it's especially important to cite the source for an index measurement if precision is required.
Download as PDF; Printable version; From Wikipedia, the free encyclopedia. Redirect page. Redirect to: Negative-index metamaterial ...
The earliest research in metamaterial antennas was an analytical study of a miniature dipole antenna surrounded with a metamaterial. This material is known variously as a negative index metamaterial (NIM) or double negative metamaterial (DNG) among other names. [10]