Optical film
First Claim
1. A multilayered optical film, comprising a plurality of layers, wherein at least one of the plurality of layers is birefringent and wherein a refractive index difference between at least two layers along a z-axis perpendicular to the film is selected to provide a desired relationship of reflectivity as a function of incidence angle for p-polarized light.
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Accused Products
Abstract
Birefringent optical films have a Brewster angle (the angle at which reflectance of p-polarized light goes to zero) which is very large or is nonexistent. This allows for the construction of multilayer mirrors and polarizers whose reflectivity for p-polarized light decreases slowly with angle of incidence, are independent of angle of incidence, or increase with angle of incidence away from the normal. As a result, multilayer films having high reflectivity (for both planes of polarization for any incident direction in the case of mirrors, and for the selected direction in the case of polarizers) over a wide bandwidth, can be achieved.
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Citations
16 Claims
- 1. A multilayered optical film, comprising a plurality of layers, wherein at least one of the plurality of layers is birefringent and wherein a refractive index difference between at least two layers along a z-axis perpendicular to the film is selected to provide a desired relationship of reflectivity as a function of incidence angle for p-polarized light.
Specification