Patent ID: 8649100

Claim:
A metamaterial for separating an electromagnetic wave beam, being adapted to separate two incident electromagnetic waves whose electric fields are orthogonal to each other, wherein the metamaterial comprises at least one metamaterial sheet layer, each of the at least one metamaterial sheet layer comprises a substrate, and first man-made microstructures and second man-made microstructures arranged in an array form on the substrate, each of the first man-made microstructures has a principal optical axis parallel to a first electric field direction, each of the second man-made microstructures has a principal optical axis parallel to a second electric field direction, the metamaterial comprises a first region and a second region, the first man-made microstructures in the first region have the largest geometric size and the first man-made microstructures in other regions increase in geometric size continuously in a direction towards the first region, the second man-made microstructures in the second region have the largest geometric size and the second man-made microstructures in other regions increase in geometric size continuously in a direction towards the second region, the first man-made microstructures and the second man-made microstructures are arranged on two opposite surfaces of the substrate in an array form respectively, the first man-made microstructures and the second man-made microstructures are each of a non-90° rotationally symmetrical structure, the first man-made microstructures are each of a “ ” form or a “ ” form, and the second man-made microstructures are each of an “H” form.