Coherence–polarization mixing in resonance gratings

Abstract

We show, using rigorous diffraction theory, that resonance gratings can be used to transfer partial spatial correlation to partial polarization even if the incident light beam is fully polarized. The phenomenon is based on the fact that either of the two orthogonal polarization components can be coupled into the leaky waveguide mode, leading to a strong phase delay, while the other one is reflected without being coupled into the grating. Numerical demonstrations are based on a Gaussian Schell-model beam and a grating analysis performed by rigorous Fourier modal method.

Recent Advances in Resonant Waveguide Gratings

“…Fully deterministic depolarizers can also be implemented using thin RWGs for quasi‐monochromatic light, by implementing a total reflection configuration that lets the guided mode travel longer than the coherence length, as illustrated in Figure c . A similar principle can also be used to transfer spatial correlation to partial polarization, enabling a drop in the degree of polarization for the reflected beam . TM to TE polarization rotation could be achieved using conical incidence on an RWG .…”

“…[302] A similar principle can also be used to transfer spatial correlation to partial polarization, enabling a drop in the degree of polarization for the reflected beam. [303] TM to TE polarization rotation could be achieved using conical incidence on an RWG. [19,304] Half-wave and quarter-wave retarders made with RWGS have also been demonstrated.…”