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US 7,064,899 B2Granted
Reduced loss diffractive structure
AssigneeDigital Optics Corporation
InventorsRobert Te Kolste, Michael R. Feldman
Life of this patent
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Abstract
A sub-wavelength anti-reflective diffractive structure is incorporated with a base diffractive structure having a small period to form a high efficiency diffractive structure. In the high efficiency diffractive structure, the anti-reflective structure and/or the base diffractive structure are altered from their ideal solo structure to provide both the desired performance and minimize reflections.
Claims20
A diffractive structure, comprising:
- a base diffractive structure which provides a desired function at a design wavelength, the base diffractive structure having a period on the order of the design wavelength;
- an anti-reflective diffractive structure having a period that is smaller than the design wavelength, wherein a depth of the anti-reflective structure is on an order of a depth of the base diffractive structure;
- a combined diffractive structure formed by adding the base diffractive structure and the anti-reflective structure together;
- an optimized diffractive structure formed by varying at least one of the depth and the duty cycle of the combined diffractive structure to jointly optimize the desired function and the anti-reflection;
- and
- a surface on which the optimized diffractive structure is formed.
3 more elements
A diffractive structure, comprising:
- a base diffractive structure which provides a desired function at a design wavelength;
- an anti-reflective diffractive structure having a period that is smaller than the design wavelength, wherein a depth of the anti-reflective structure is on an order of a depth of the base diffractive structure;
- an integrated diffractive structure formed by deviating at least one of the base diffractive structure and the anti-reflective structure from an optimal design for that structure alone;
- and
- a surface on which the integrated diffractive structure is formed.
2 more elements
Dependencies are inferred from the claim text.