Patent ID: 8681429

Claim:
A metamaterial comprises a plurality of metamaterial sheet layers stacked integrally in an x direction, each of the metamaterial sheet layers comprises a plurality of metamaterial units, each of the metamaterial units has an identical substrate unit and a man-made microstructure attached on the substrate unit, the metamaterial units being arranged into a first array which takes a y direction perpendicular to the x direction as a column direction and a z direction perpendicular to both the x direction and the y direction as a row direction, wherein: the metamaterial units of each row have a same refractive index, the metamaterial units of each column have refractive indices of a 1 , a 2 , a 3 , . . . , a s , b 1 , b 2 , b 3 , . . . , b m , c 1 , c 2 , c 3 , . . . , c p in sequence, and the refractive indices satisfy: a 1 ≦a 2 ≦a 3 . . . ≦a s , c 1 ≧c 2 ≧c 3 . . . ≧c p ; where b 1 <a s , b m <c 1 , s and p are both natural numbers no less than 2, and m is a natural number no less than 1; and the man-made microstructure is a non-90° rotationally symmetrical structure, and the extraordinary light optical axis of each microstructure's refractive index ellipsoid thereof is neither perpendicular nor parallel to the y direction.