Optical waveguide using overlapping optical elements coupling light beam
First Claim
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1. An optical waveguide comprising:
- a first optical element disposed on a first surface of the optical waveguide; and
a second optical element disposed on a second surface of the optical waveguide, the second surface being on opposite side of the optical waveguide from the first surface;
wherein a section of the first optical element overlapping the second optical element is configured to in-couple a received beam of light into the optical waveguide; and
wherein a section of the second optical element is configured to out-couple the received beam of light from the optical waveguide in a second direction.
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Abstract
An optical waveguide that performs both in-coupling and out-coupling using two diffractive optical elements is provided. Each optical element is a diffraction grating and can be applied to the same or different surface of the optical waveguide. The diffraction gratings overlap to form two overlapping regions. The first overlapping region in-couples light into the waveguide and the second overlapping region out-couples light from the optical waveguide. Because the optical waveguide only uses two gratings, and therefore only has two grating vectors, the optical waveguide is easier to manufacture than optical waveguides with a greater number of grating vectors.
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13 Claims
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1. An optical waveguide comprising:
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a first optical element disposed on a first surface of the optical waveguide; and a second optical element disposed on a second surface of the optical waveguide, the second surface being on opposite side of the optical waveguide from the first surface; wherein a section of the first optical element overlapping the second optical element is configured to in-couple a received beam of light into the optical waveguide; and wherein a section of the second optical element is configured to out-couple the received beam of light from the optical waveguide in a second direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method comprising:
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providing a first optical element on a first surface of an optical waveguide, wherein the first optical element defines a first region; providing a second optical element on a second surface of the optical waveguide, the second surface being defined by a side opposing the side of the optical waveguide; receiving a beam of light and in-coupling the received beam of light into the optical waveguide by a section of the first optical element of the optical waveguide; causing the received beam of light to traverse within the optical waveguide in a first direction by one or both of the first region and the second region; and out-coupling the received beam of light from the optical waveguide in a second direction by a section of the second optical element. - View Dependent Claims (10, 11, 12, 13)
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Specification