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Inorganic, dielectric, grid polarizer and non-zero order diffraction grating

  • US 7,630,133 B2
  • Filed: 01/31/2007
  • Issued: 12/08/2009
  • Est. Priority Date: 12/06/2004
  • Status: Expired due to Fees
First Claim
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1. An inorganic, dielectric grid polarizer device configured to polarize and further control light incident on the device, comprising:

  • an optical stack with a diffraction grating and an inorganic, dielectric grid polarizer with one disposed over the other;

    the inorganic, dielectric grid polarizer including;

    a stack of film layers,each film layer being formed of a material that is both inorganic and dielectric;

    adjacent film layers having different refractive indices;

    at least one of the film layers being discontinuous to form a form birefringent layer with an array of parallel ribs in accordance with PGP<

    λ

    /2 where PGP is the period of the ribs of the grid polarizer and λ

    is the wavelength of the light, to polarize any light incident on the grid polarizer by substantially reflecting the light incident on the grid polarizer with s-polarization orientation and substantially transmitting the light incident on the grid polarizer with p-polarization orientation;

    the diffraction grating including an array of elongated parallel dielectric ribs in accordance with PDG>

    λ

    /2 where PDG is the period of the ribs of the diffraction grating, to substantially diffract any light incident on the diffraction grating with the s-polarization orientation of non-zero order at a non-orthogonal angle, so that the diffraction grating and the grid polarizer together substantially pass the light incident on the device having the p-polarization orientation while substantially diffracting light incident on the device having the s-polarization orientation.

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