Waveguide lens including planar waveguide and media grating

A waveguide lens, comprising:

• a substrate comprising a top surface and an opposite bottom surface;
• a planar waveguide formed on the top surface of the substrate, the planar waveguide coupled with a laser light source which emits a laser beam having a divergent angle into the planar waveguide;
• a media grating formed on the planar waveguide;
• a pair of first electrodes arranged on the planar waveguide, the pair of first electrodes comprising a first modulating electrode and a first ground electrode;
• and
• a pair of second electrodes comprising a second modulating electrode and a second ground electrode;
• wherein the first modulating electrode and the first ground electrode are arranged at two opposite sites of the media grating;
• the second modulating electrode overlaying the media grating;
• the second ground electrode is opposite to the second modulating electrode;
• the pair of first electrodes configured to change an effective refractive index of the planar waveguide, utilizing an electro-optical effect, when a first modulating electric field is applied, wherein the effective refractive index is corresponding to a transverse electric wave of the laser beam;
• the pair of second electrodes configured to change an effective refractive index of the planar waveguide, utilizing an electro-optical effect, when a second modulating electric field is applied, wherein the effective refractive index is corresponding to a transverse magnetic wave of the laser beam.