Optical arrangement and proof of concept prototype for mid infrared variable angle spectroscopic ellipsometry

We present an optical setup for variable angle mid infra red spectroscopic ellipsometry. The arrangement can be placed into the sample compartment of a Bruker ifs66v/s vacuum Fourier transform infrared spectrometer. A first prototype of the setup has been tested in the spectral range from 650 cm−1 to 4000 cm−1 and can measure incidence angles between 8° and 87°. We compare the measured data to reference measurements with a commercial variable angle infrared spectroscopic ellipsometer. The comparison gives a proof of concept for the discussed optical arrangement.