New paper in Optics Express about using geometric lenses to perform polarization sensitive Fourier filtering
A new paper is published in Optics Express entitled Dual Fourier transform processor using geometric-phase lenses by Pascuala GarcÃa-MartÃnez and Ignacio Moreno.
This work presents a novel optical system for polarization image processing using geometric-phase (Pancharatnam-Berry) lenses. These lenses present the same focal length but opposite sign for left and right circular polarizations. Therefore, they split an input collimated beam in a converging beam and a diverging beam with opposite circular polarizations. Here we profit from these properties to build an optical Fourier filter system with polarization sensitivity. A telescopic system is used to have access to two real Fourier transform planes, one for each circular polarization. A second symmetric optical system is used to recombine the two beams onto a single final image. As a result, polarization sensitive optical Fourier filtering can be applied, as demonstrated with simple bandpass filters.