  Wave polarization contains valuable information for electromagnetic signal
processing and the ability to manipulate it can be extremely useful in photonic
devices. In this work, we propose designs comprised of one of the emerging and
interesting two-dimensional media: Black Phosphorus. Due to substantial
in-plane anisotropy, a single slab of Black Phosphorus can be very efficient
for manipulating the polarization state of electromagnetic waves. We
investigate Black Phosphorus slabs that filter the fields along one direction,
or polarization axis rotation, or convert linear polarization to circular.
These slabs can be employed as components in numerous mid-IR integrated
devices.
