| 摘要 |
PROBLEM TO BE SOLVED: To provide a polarized beam splitter with which a high degree of polarization can be obtained. SOLUTION: The polarized beam splitter is equipped with striped cavernous layers in which cavities line up in a stripe form at periods shorter than the use wavelengths in a transparent material corresponding to the prescribed use wavelength within the element composed of the transparent material. The volume ratio f of the cavities occupying in the striped cavernous layers satisfies 1/√(f+(1-f)*n^2)<sinθ<√(f+(1-f)/n^2), where the prescribed use incident angle as the angle formed by the incident rays incident on the striped cavernous layers in parallel with the plane inclusive of the perpendicular direction of the striped cavernous layers and the direction where the cavities extend and the perpendicular direction of the striped cavernous layers is defined asθ, and the refractive index of the transparent material at the use wavelength as n. COPYRIGHT: (C)2007,JPO&INPIT
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