Daniel Luke Carr
Measuring the Faraday effect in olive oil using permanent magnets and Malus' law
Carr, Daniel Luke; Spong, Nicholas L.R.; Hughes, Ifan Glyndwr; Adams, Charles S
Authors
Nicholas Leonard Robert Spong nicholas.l.spong@durham.ac.uk
PGR Student Doctor of Philosophy
Professor Ifan Hughes i.g.hughes@durham.ac.uk
Professor
Professor Stuart Adams c.s.adams@durham.ac.uk
Professor
Abstract
We present a simple permanent magnet set-up that can be used to measure the Faraday effect in gases, liquids and solids. By fitting the transmission curve as a function of polarizer angle (Malus' law) we average over short-term fluctuations in the laser power and can extract phase shifts as small as ± 50 μrads. We have focused on measuring the Faraday effect in olive oil and find a Verdet coefficient of V = 192 ± 1 deg T-1 m-1 at approximately 20 °C for a wavelength of 659.2 nm. We show that the Verdet coefficient can be fit with a Drude-like dispersion law A / (λ2 - λ0 2) with coefficients A = 7.9 ± 0.2 × 107 deg T-1 m-1 nm2 and λ0 = 142 ± 13 nm.
Citation
Carr, D. L., Spong, N. L., Hughes, I. G., & Adams, C. S. (2020). Measuring the Faraday effect in olive oil using permanent magnets and Malus' law. European Journal of Physics, 41(2), Article 025301. https://doi.org/10.1088/1361-6404/ab50dd
Journal Article Type | Article |
---|---|
Acceptance Date | Oct 24, 2019 |
Online Publication Date | Jan 13, 2020 |
Publication Date | Jan 1, 2020 |
Deposit Date | Oct 25, 2019 |
Publicly Available Date | Jan 13, 2021 |
Journal | European Journal of Physics |
Print ISSN | 0143-0807 |
Electronic ISSN | 1361-6404 |
Publisher | IOP Publishing |
Peer Reviewed | Peer Reviewed |
Volume | 41 |
Issue | 2 |
Article Number | 025301 |
DOI | https://doi.org/10.1088/1361-6404/ab50dd |
Files
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Publisher Licence URL
http://creativecommons.org/licenses/by-nc-nd/4.0/
Copyright Statement
The deposited file will be available for reuse under a CC BY-NC-ND 3.0 licence after a 12 month embargo period from the date of publication.
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