A method of forming a polarizing material is provided including exposing a layer of dichroic material to activating light illumination to provide an ordered structure with a distinguished absorption axis and thus photo-induce polarization, and fixing the induced polarization by polymerization of the dichroic layer. Via the bypass PMOS and NMOS transistors, charges with either polarity are conveyed and neutralized. A switchover controller causes outputs from the secondary modules to be discarded. The illumination grating is configured to diffract the first and second source light portions to the scale track such that only two orders of diffracted light overlap within an imaged region. The pig gate valve assembly also includes a first actuator and a second actuator.