FOCUS started already back in 2010 to design, build and install the electron optics for the first tungsten-based Imaging 2D Spinfilter prototype (Tusche et al., Appl. Phys. Lett. 99, 032505 (2011), doi:10.1063/1.3611648.)

The first two FOCUS-built and Iridium-based 2D Imaging Spinfilter in operation are located at

ELI ALPS ( and Trondheim University ).

At the latter you also can see first spin-resolved ARPES data from the NanoESCA:

[Sample is Bi(111), and the two greyscale images are the raw signal at the two working points of the spin filter. The right hand panel is the difference. The energy is just below the Fermi energy.]