RESUMEN
We present a method for obtaining a pure Faraday rotator by using a ferrofluid material. We demonstrate indeed that compatible magnetic liquids can be mixed in suitable proportions so as to cancel the circular dichroism at selected wavelengths in the visible-near-IR spectrum.
RESUMEN
An original (to the best of our knowledge) method to achieve azimuthal alignments of all polarizing components in ellipsometry is presented. It is an accurate nulling method, and it is easy to implement and can be used with any isotropic reflecting layer. It also allows one to check the eventual presence of surface anisotropy. The ferrofluid modulator used in this setup is briefly described. Measurements made for three reflecting surfaces (fused silica, silicon, and germanium) are presented.
