Measuring the Faraday effect in olive oil using permanent magnets and Malus' law
| Autor: | Carr, Daniel L., Spong, Nicholas L. R., Hughes, Ifan G., Adams, Charles S. |
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| Rok vydání: | 2019 |
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| Zdroj: | Eur. J. of Phys. 41 025301 (2020) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1088/1361-6404/ab50dd |
| Popis: | 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 fluctuations in the laser intensity and can extract phase shifts as small as $\pm$ 50 $\mu$rads. We have focused on measuring the Faraday effect in olive oil and find a Verdet coefficient of $V$ = 192 $\pm$ 1 deg T$^{-1}$ m$^{-1}$ at approximately 20 $^{\circ}$C for a wavelength of 659.2 nm. We show that the Verdet coefficient can be fit with a Drude-like dispersion law $A/(\lambda^2 - \lambda_0^2)$ with coefficients $A$ = 7.9 $\pm$ 0.2 $\times$ 10$^{7}$ deg T$^{-1}$ m$^{-1}$ nm$^2$ and $\lambda_0$ = 142 $\pm$ 13 nm. Comment: 12 pages, 7 figures This is the version of the article before peer review or editing, as submitted by an author to European Journal of Physics. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at https://dx.doi.org/10.1088/1361-6404/ab50dd |
| Databáze: | arXiv |
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