Inorganic, dielectric, grid polarizer and non-zero order diffraction grating
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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Abstract
An inorganic, dielectric grid polarizer includes an optical stack with a diffraction grating and an inorganic, dielectric grid polarizer. The inorganic, dielectric grid polarizer includes a stack of film layers with an array of parallel ribs in accordance with PGP<λ/2 where PGP is the period of the ribs and λ is the wavelength of the light. The diffraction grating includes an array of elongated parallel dielectric ribs in accordance with PDG>λ/2 where PDG is the period of the ribs.
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Citations
20 Claims
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1. An inorganic, dielectric grid polarizer device configured to polarize and further control light incident on the device, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An inorganic, dielectric grid polarizer device configured to polarize and further control light incident on the device, comprising:
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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 the light incident on the device having s-polarization orientation; andthe ribs of the diffraction grating being split into rib pairs of two relatively adjacent ribs that maintain the period between the rib pairs. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification