Scientific article

Magneto-optical Kramers-Kronig analysis

Published inReview of scientific instruments, vol. 86, no. 3, 033906
Publication date2015-03

We describe a simple magneto-optical experiment and introduce a magneto-optical Kramers-Kronig analysis (MOKKA) that together allow extracting the complex dielectric function for left- and right-handed circular polarizations in a broad range of frequencies without actually generating circularly polarized light. The experiment consists of measuring reflectivity and Kerr rotation, or alternatively transmission and Faraday rotation, at normal incidence using only standard broadband polarizers without retarders or quarter-wave plates. In a common case, where the magneto-optical rotation is small (below ∼0.2 rad), a fast measurement protocol can be realized, where the polarizers are fixed at 45∘ with respect to each other. Apart from the time-effectiveness, the advantage of this protocol is that it can be implemented at ultra-high magnetic fields and in other situations, where an in-situ polarizer rotation is difficult. Overall, the proposed technique can be regarded as a magneto-optical generalization of the conventional Kramers-Kronig analysis of reflectivity on bulk samples and the Kramers-Kronig constrained variational analysis of more complex types of spectral data. We demonstrate the application of this method to the textbook semimetals bismuth and graphite and also use it to obtain handedness-resolved magneto-absorption spectra of graphene on SiC.

Research group
Citation (ISO format)
LEVALLOIS, Julien et al. Magneto-optical Kramers-Kronig analysis. In: Review of scientific instruments, 2015, vol. 86, n° 3, p. 033906. doi: 10.1063/1.4914846
Main files (1)
Article (Published version)
ISSN of the journal0034-6748

Technical informations

Creation18.01.2022 15:42:00
First validation18.01.2022 15:42:00
Update time16.03.2023 02:24:04
Status update16.03.2023 02:24:04
Last indexation06.05.2024 08:54:03
All rights reserved by Archive ouverte UNIGE and the University of GenevaunigeBlack