The polarization of electromagnetic waves describes the orientation of wave oscillations perpendicular to the direction of propagation. A wire grid polarizer is an array of thin metal lines/wires closely spaced sitting on top of a transparent substrate. It works as an absorptive polarizer and only passes through light oscillating perpendicular to the wires.
Light oscillating in parallel with the wires will generate electron movement along the wires in response to the oscillating field. The electron movement creates a travelling wave cancelling the incoming waves oscillating parallel to the wires and reflects it in the same manner as a thin metal sheet. The components of the incoming wave having a polarization parallel to the wires are thus reflected with some loss due to Joule heating caused by electron movement in the wires.
Since only a specific polarization is allowed through the wire grid polarizer, the outgoing wave will have a single linear polarization.
Besides custom WGP stamps, we provide also WGP standard stamps. Take a look here.