Differential polarization imaging systems include an axicon configured to provide a displacement of ray bundles associated with different image patches. The displaced ray bundles are directed to antenna horns and orthomode transducers so as to provide outputs correspond to orthogonal linear states of polarization (SOPs). The outputs are directed to a differential radiometer so that Stokes parameter differences between image patches can be obtained. The ray bundle displacements can be selected to correspond to a mechanical spacing of antenna horns. In some examples, ray bundle displacement corresponds to a displacement less than the diffraction limit.
ACKNOWLEDGMENT OF GOVERNMENT SUPPORT
This invention was made with government support under contract number DE-AC05-76RL01839 awarded by the U.S. Department of Energy, Office of Nonproliferation Research (NA-22). The government has certain rights in the invention.