Thin film polarizing device

G - Physics – 02 – B

Patent

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G02B 5/30 (2006.01)

Patent

CA 2224694

A thin film polarizing device has first (60) and second (65) light transmissive substrates in the form of prisms and a plurality of thin film layers (64) disposed between the prisms. The thin film layers have predetermined thicknesses and refractive indices which allow unpolarized incident light to be separated into s-polarized and p-polarized light beams. Both frustrated total internal reflection and thin film interference are simultaneously employed to allow s-polarized light to be transmitted and p- polarized light to be reflected over a wide range of wavelengths and angles of incidence. The polarizing device may be used as a polarizer or a polarizer beam splitter.

Dispositif polarisant à couches minces pourvu de premiers (60) et de deuxièmes (65) substrats translucides se présentant sous la forme de prismes et de plusieurs couches minces (64) positionnées entre les prismes. Les couches minces ont des épaisseurs et des indices de réfraction prédéfinis qui permettent à la lumière incidente non polarisée de se fractionner en faisceaux de lumière polarisés en composants s et en composants p. On emploie simultanément à la fois la totalité de la réflexion interne contrecarrée et l'interférence à couche mince pour permettre à la lumière polarisée en composant s d'être diffusée et à la lumière polarisée en composant p d'être réfléchie sur une gamme importante de longueurs d'onde et d'angles d'incidence. Le dispositif polarisant peut s'utiliser comme polariseur ou comme séparateur de faisceau polarisant.

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