HIGH EFFICIENCY MONO-ORDER CONCAVE DIFFRACTION GRATING

摘要

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.

主权项

1. A device comprising:
an arrangement of a plurality of elements, each of the elements having a finite thickness and being spaced apart from adjacent elements, each element having an elliptical shape and being locally parallel to elements located adjacent to the 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.