Patent ID: 8467128

Claim:
A polarizing cube, comprising: a thin composite plate comprising a planar array of straight wires and a first transmissive material, said straight wires made of a reflective material, spaced apart in parallel and surrounded by the first transmissive material; and a first thick substrate and a second thick substrate, made from a second transmissive material and bonded, respectively, to opposite faces of, and sandwiching the thin composite plate; a pair of symmetric triangular prisms, made from the second transmissive material and bonded, respectively, to opposite faces of, and sandwiching the combination of the first thick substrate, the thin composite plate and the second transmissive material so as to form the polarizing cube; wherein the thin composite plate and the pair of symmetric triangular prisms are optically symmetric about a diagonal plane of the polarizing cube, and the diagonal plane extends through the thin composite plate; and the first transmissive material is the same as the second transmissive material, and the first transmissive material and the second transmissive material are optically transmissive material.