Patent ID: 9500771
Filing Date: 2016-11-22
CPC Classification: G02B,H01Q

Claim Text:
1. A metamaterial for converging electromagnetic waves is consisted of a plurality of cubic metamaterial units arranged in a first array which takes a y direction as a column direction and a z direction perpendicular to the y direction as a row direction, wherein the metamaterial units of each row have the same refractive index, and for the metamaterial units of each column, the refractive indices thereof for the electromagnetic waves decrease gradually from a middle metamaterial unit towards two ends of the column, with variations of the refractive indices between adjacent ones of the metamaterial units increasing gradually from the middle metamaterial unit towards the two ends of the column; and the metamaterial units are anisotropic to the electromagnetic waves; wherein each of the metamaterial units comprises a cubic substrate unit and a man-made microstructure disposed in the substrate unit, the substrate unit of each of the metamaterial units is same, and the man-made microstructure of each of the metamaterial unit is a non-90° rotationally symmetrical structure; for each row of the metamaterial units, man-made microstructures of the metamaterial units in a same row are same in size; and for each column of the metamaterial units, man-made microstructures of the metamaterial units in a same column are decreased gradually in size from the middle metamaterial unit towards two ends of the same column; each of the man-made microstructures of the metamaterial units is rotated by a angle no more than 90° and larger than 0° with respect to the z direction, so as to reduce a focal distance of the metamaterial, wherein for each row of the metamaterial units, the man-made microstructures of the metamaterial units in a same row are rotated by a same angle with respect to the z direction, and the same angle is no more than 90° and larger than 0°; and for each column of the metamaterial units, each of the man-made microstructures of the metamaterial units in a same column is rotated by an angle with respect to the z direction, the angle is no more than 90° and larger than 0°, and the angle is decreased gradually from the middle metamaterial unit towards two ends of the same column.