Wideband film polarizer design

The reflection and transmittance of s- and p-polarized lights should be treated separately at nonzero angle incidence.By choosing two special film materials whose refractive indices meet the Brewster condition in a given incident angle,the reflection of p-polarized light can be eliminated.When the two materials are fabricated into multilayer stacks,the reflection of s-polarized light can be largely increased while the reflection of p-polarized light keeps low.According to this principle,a film polarizer with bandwidth of 198 nm or even more is designed.