  I propose a new optoelectronic device that completely and instantaneously
measures the incident light's polarization for a narrow wavelength band in a
single physical pixel. The device has four (or more) quantum-well active
regions separated and topped by four (or more) linear gratings at different
orientations. Electrical contact is made to each grating and to a bottom
contact layer to measure four (or more) photocurrents. The device uses
interference among many light paths to encode in four photocurrents four values
that completely describe the polarization state of the incident light at a
given wavelength. I begin with the motivation for the new device. Then, I
report on two computational models: the first includes perfectly conducting
gratings, and the second includes more realistic dielectric gratings. Next, I
will describe the design and processing of a two-layer proof-of-concept device.
Last, I will recount the trials of the first round of fabrication.
