Last year I spent a lot of my time to build the instrument reported in this paper. It is one of the bests polarimeters/ellipsometers to date, because it measures simultaneously the 16 elements of a Mueller matrix without any moving part.
- Oriol Arteaga, John Freudenthal, Baoliang Wang, and Bart Kahr, “Mueller matrix polarimetry with four photoelastic modulators: theory and calibration,” Appl. Opt. 51, 6805-6817 (2012)
You can get it here.
More exciting instrumental things should be coming soon!