Analysis of a Remote Magneto-Optic Linear Displacement Sensor Using a Jones Matrix Approach

Recently we reported a magneto-optic linear displacement (MOLD) sensor which can remotely measure linear displacements of the surface of materials with a spatial resolution of 4 mum. This sensor is based on temporal changes in the intensity of the reflected polarized light beam passing through a magneto-optic garnet thin film with controlled periodic displacement of a single domain wall. This paper shows how to use Jones matrices to represent optical elements in the MOLD sensor system. The simulated variation of the intensity of detected light in the MOLD sensor was obtained over one cycle, and this was compared with the experimentally detected intensity. The simulation results are in good agreement with experimental values