Optical film
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United States of America Patent
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Oct 21, 2003
Grant Date -
May 23, 2002
app pub date -
Aug 10, 2001
filing date -
Dec 21, 1993
priority date (Note) -
Expired
status (Latency Note)
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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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