High efficiency mono-order concave diffraction grating
First Claim
Patent Images
1. A device comprising:
- an arrangement of a plurality of adjacent linear, elliptically shaped elements, each of the elements having a finite thickness, wherein each linear element, along its length, is locally parallel to an adjacent linear element in a direction substantially normal to the linear element;
a grating surface defined by portions of at least a subset of the plurality of elements;
a first port and at least one second port located at foci of an ellipse defining the elliptical shape of the plurality of elements.
2 Assignments
0 Petitions
Accused Products
Abstract
A concave diffraction grating for integrated optics is constructed by replacing the reflective metallic part by either multiple thin elements of metal or multiple elements of dielectric material, each partially reflecting the light, and arranged on elliptical fashion in order to distribute the diffraction/reflection of light and provide aberration-free focusing, by combining diffraction condition and Bragg condition of these curved reflectors.
57 Citations
24 Claims
-
1. A device comprising:
-
an arrangement of a plurality of adjacent linear, elliptically shaped elements, each of the elements having a finite thickness, wherein each linear element, along its length, is locally parallel to an adjacent linear element in a direction substantially normal to the linear element; a grating surface defined by portions of at least a subset of the plurality of elements; a first port and at least one second port located at foci of an ellipse defining the elliptical shape of the plurality of elements. - View Dependent Claims (2, 3, 4, 5)
-
- 6. A device which has a diffraction grating comprising a plurality of adjacent linear elements, wherein each linear element, along its length, is substantially locally parallel to an adjacent linear element in a direction substantially normal to the linear element and wherein the elements providing the reflection are curved for their reflective properties in relation to their neighbours and/or for focusing.
Specification