We present magneto-optical Kerr effect (MOKE) spectrometer based on a modified Martin-Puplett interferometer, utilizing continuous wave sub-THz low-power radiation in broad frequency range. This spectrometer is capable of measuring the frequency dependence of the MOKE response function, both the Kerr rotation and ellipticity, simultaneously with sub-milliradian accuracy without the need for reference measurement. The instrument's versatility allow it to be coupled to a cryostat with optical windows enabling studies of a variety of quantum materials such as unconventional superconductors, two-dimensional electron gas systems, quantum magnets, and other system showing optical Hall response, at sub-Kelvin temperatures and in high magnetic fields. We demonstrate the functionality of the MOKE spectrometer using an undoped InSb wafer as a test sample.
@article{arxiv.2407.19334,
title = {Modified Martin-Puplett interferometer for magneto-optical Kerr effect measurements at sub-THz frequencies},
author = {A. Glezer Moshe and R. Nagarajan and U. Nagel and T. Rõõm and G. Blumberg},
journal= {arXiv preprint arXiv:2407.19334},
year = {2024}
}