To provide a polarizer of high polarization splitting efficiency wherein polarization splitting characteristics is improved and to provide the manufacturing method of the polarizer by which the polarizer can be easily and inexpensively mass-produced by using an optical thin film.
In the polarizer 1, a plurality of rectangular poles 13, each of which is obtained by sticking hypotenuses of two glass materials 11, 12 having the cross-section of a right-angled triangle shape, are arranged in parallel to each other along a light incident surface 1a. A polarization splitting film 14 for splitting the incident light to two kinds of linearly polarized light is provided to a hypotenuse interface between the glass materials 11, 12 and an absorption film 15 for absorbing the linearly polarized light which is made incident after being split by the polarization splitting film 14 is provided to the right-angled interface of the rectangular pole 13 each of which is arranged in parallel to each other. Only one kind of p polarized light among light beams made incident on the light incident surface 1a of the polarizer 1 (s polarized light + p polarized light) is emitted from a light emitting surface 1b. The absorption film 15 comprises an antireflection layer and an absorption layer made of a dielectric film composed of at least one of Si, TiOx and Nb2O5.
Osamu Suzawa
Kazuhiko Miyasaka
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