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arXiv · 2609.36917

Transverse Faraday Effect in Multimode Fibres

Mohammed R. Sharif·Mitchell A. Cox
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Abstract

The weak guidance approximation suppresses the longitudinal field component $E_z$, and with it an entire class of linear magneto-optic interactions. We derive and experimentally verify a transverse Faraday effect in step-index multimode fibres that couples $E_y$ into $E_z$. Using speckle decorrelation we isolate the linear Faraday signal from the quadratic Cotton-Mouton background, confirming four predictions: the effect vanishes without a strong index step, scales with launch angle, is completely polarisation-selective relative to the field, and tracks Verdet dispersion. Under 0.24 T we observe $Δρ\approx 0.16$ for perpendicular input and a complete null for parallel input.

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Mohammed R. Sharif, Mitchell A. Cox. 2026-09-29. Transverse Faraday Effect in Multimode Fibres. https://doi.org/10.1364/ol.611078

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