Light sensing system and light sensor with polarizer

A light sensing system comprising:

• a plurality of light sensors, each of the light sensors including:
• a photodiode disposed in a semiconductor layer, wherein the photodiode is coupled to generate charge in response to incident light directed through a first side of the semiconductor layer;
• an interlayer dielectric layer disposed proximate to the first side of the semiconductor layer;
• a plurality of metal layers disposed in the interlayer dielectric layer, wherein the plurality of metal layers includes electrical conductors coupled to circuit elements disposed proximate to the first side the semiconductor layer, wherein the circuit elements are coupled to the photodiode, wherein the plurality of metal layers includes a first metal layer, a second metal layer, and a third metal layer;
• and
• a polarizer disposed in the plurality of metal layers, wherein the polarizer comprises:
• a first metal grid formed with the first metal layer;
• and
• a second metal grid formed with the third metal layer, wherein the second metal grid is stacked with the first metal grid such that the first and second metal grids are disposed above and aligned with the photodiode, wherein the photodiode is optically coupled to receive the incident light through the first and second metal grids of the polarizer and through the first side of the semiconductor layer;
• control circuitry coupled to control transmission of output from each of the plurality of light sensors, wherein the output of each of the plurality of light sensors is based on the charge generated by the photodiode;
• and
• readout circuitry coupled to receive an output from each of the plurality of light sensors,
• wherein the plurality of light sensors are arranged in groups of light sensors, wherein each of the light sensors in a group of light sensors among the groups of light sensors includes the first and second metal grids with a polarization orientation different from a polarization orientation of the first and second metal grids of the other light sensors of the group of light sensors.