Method for manufacturing waveguide lens

A method for manufacturing a waveguide lens, the method comprising:

• providing a planar waveguide, wherein the planar waveguide comprising a top surface and a side surface perpendicularly connecting the top surface, the side surface is configured for coupling to a laser light source, and the laser light source emits a laser beam having a divergent angle and an optical axis substantially perpendicular to the side surface;
• depositing a media film grating on the top surface, the media film grating made of a high refractive index material, wherein the media film grating comprises a plurality of parallel media film strips, each of which is substantially perpendicular to the side surface;
• and
• forming a pair of strip-shaped electrodes on the top surface, wherein the electrodes are arranged at opposite sides of the media film grating and the optical axis, and substantially parallel with the media film strips;
• wherein the media film grating comprises a plurality of media film strips, the number of the media film strips is odd, the media film strips are symmetrical about a widthwise central axis of the media film grating, each of the media film strips is rectangular and parallel with each other, in this order from the widthwise central axis to each widthwise side of the media film grating, widths of the media film strips decrease, and widths of gaps between each two adjacent media film strips also decrease;
• wherein 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 film strips are set to conform condition formulae:
• x
• n
• =
• ln
• 
• (
• 1
• -
• n
• 
• 
• π
• a
• )
• k
• ,
• and xn>0, wherein xn is the nth boundary of the media film strips along the “x” axis, and a and k are constants.