Metamaterial

Abstract

The invention discloses a metamaterial. The response of the metamaterial to electromagnetic waves is equal to the response of a convex mirror to electromagnetic waves, wherein the convex mirror is formed by the intersection of two spherical surfaces with a radius r. The metamaterial comprises a base material and multiple artificial microstructures, wherein the multiple artificial microstructures are periodically arranged on the surface of the base material. The refractive index distribution of the metamaterial meets a rule shown in the specification. Compared with the traditional lens, the metamaterial is smaller in volume and simpler in processing, and an electromagnetic wave which is emitted by a point source is larger in far-field maximum and smaller in half-power bandwidth after passing through the metamaterial.

Description

technical field [0001] The invention relates to the field of materials, in particular to a metamaterial capable of converting spherical electromagnetic waves into plane electromagnetic waves. Background technique [0002] Light, as a kind of electromagnetic wave, when it passes through glass, because the wavelength of light is much larger than the size of atoms, we can use the overall parameters of the glass, such as the refractive index, rather than the detailed parameters of the atoms that make up the glass to describe The response of glass to light. Correspondingly, when studying the response of materials to other electromagnetic waves, the response of any structure in the material whose scale is much smaller than the wavelength of the electromagnetic wave to electromagnetic waves can also be described by the overall parameters of the material, such as the dielectric constant ε and magnetic permeability μ. By designing the structure of each point of the material, the die...

AI Technical Summary

Problems solved by technology

[0003] Existing optical instruments generally use convex or concave lenses when responding to light. When it is necessary to converge the light at one point, a convex lens can be used; however, the thickness of the convex lens is not uniform and the overall thickness of the convex lens is relatively thick due to the limitations of the material itself.

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