Polarization-filtered cathodoluminescence imaging is one of the six imaging modes that are available in the SPARC CL detector. So far we focused on how cathodoluminescence measurements can reveal spectral content and angular distribution of the emission. In this post, we explain how cathodoluminescence polarization can be an important tool for in-depth analysis of material emission.
Polarization is a light property, which describes in what direction electromagnetic fields oscillate. Recent breakthroughs in the characterization of nanophotonic structures with polarization have demonstrated the importance of mapping the full polarization properties . Cathodoluminescence spectroscopy is a great technique for accessing polarization information.
In order to do that a rotating-plate polarimeter made of quarter wave plate (QWP) and linear polarizer are used an angle-resolved setup of the SPARC system (see the image above). Cathodoluminescence is collected in the