Patent ID: 7158302
Filing Date: 2007-01-02
Classification: G02B

Abstract:
1. A transmissive wire grid, full spectrum polarizer with double metal layers for use in visible spectrum, comprising: a transparent substrate; an array of parallel and elongated dielectric protrusions formed on the transparent substrate, wherein the dielectric protrusions have a period and a trench is located between adjacent dielectric protrusions; a first metal layer having a first thickness formed in the trench; and a second metal layer having a second thickness and a width formed on each dielectric protrusion, wherein the first and second metal layers are separated by a vertical distance; wherein the period is not greater than 180 nm; wherein the first thickness is not greater than 150 nm and is equal to the second thickness; wherein the vertical distance is not greater than 100 nm; wherein the ratio of the width to the period is in a range of 25˜75%, and wherein the full spectrum polarizer has an extinction ratio of transmittance (T