Negative-index metamaterial
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Negative-index metamaterial or negative-index material is a metamaterial whose refractive index for an electromagnetic wave has a negative value over some frequency range.
A negative-index metamaterial causes light to refract, or bend, differently than in more common positive-index materials such as glass lenses.
A split-ring resonator array arranged to produce a negative index of refraction, constructed of copper split-ring resonators and wires mounted on interlocking sheets of fiberglass circuit board. The total array consists of 3 by 20×20 unit cells with overall dimensions of 10×100×100 millimeters. The height of 10 millimeters measures a little more than six subdivision marks on the ruler, which is marked in inches.
Split-ring resonator consisting of an inner square with a split on one side embedded in an outer square with a split on the other side. Split-ring resonators are on the front and right surfaces of the square grid, and single vertical wires are on the back and left surfaces.
Refractive index
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In optics, the refractive index, often denoted n, is the ratio of the speed of light in vacuum to the speed of light in a given optical medium, n=c/v. The refractive index determines how much the path
Negative-index metamaterial
…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. NIMs are constructed of periodic basic parts called unit cells, which are…
Thomas Young coined the term index of refraction in 1807.
Diamonds have a very high refractive index of 2.417.
In optical mineralogy, thin sections are used to study rocks. The method is based on the distinct refractive indices of different minerals.