Waveguide lens for coupling laser light source and optical element

摘要

A waveguide lens includes a substrate, a planar waveguide formed on the substrate and configured to couple with a laser light source that emits a laser beam into the planar waveguide along an optical axis, and a media grating film including two media gratings with a gap intervening therebetween. Each media grating is symmetrical about a widthwise central axis. Each widthwise central axis and the optical axis are substantially parallel with each other and cooperatively define a plane that is substantially perpendicular to the planar waveguide.

主权项

1. A waveguide lens, comprising:
a substrate; a planar waveguide formed on the substrate and configured to couple with a laser light source that emits a laser beam into the planar waveguide along an optical axis; and a media grating film comprising two media gratings with a gap intervening therebetween, each media grating being symmetrical about a widthwise central axis, each widthwise central axis and the optical axis being substantially parallel with each other and cooperatively defining a plane that is substantially perpendicular to the planar waveguide; wherein each media grating comprises an odd number of media strips extending along a direction that is substantially parallel with its widthwise central axis, each of the media strips is rectangular; a coordinate axis “ox” is established, wherein the origin “o” is an intersecting point of the widthwise central axis and a widthwise direction of the planar waveguide, and “x” axis is the widthwise direction of the planar waveguide, boundaries of the media strips are set to conform condition formulae:xn=ln⁡(1-n⁢⁢πa)k,and xn>0, wherein xn is the nth boundary of the media strips along the “x” axis, a is a negative constant, and k is a positive constant.