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PreprintarXiv licencearXiv

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 Ez, 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 Ey into Ez. 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≈ 0.16 for perpendicular input and a complete null for parallel input.

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Cite

BibTeXRIS
BibTeX
@misc{sharif2026transverse,
  title = {{Transverse Faraday Effect in Multimode Fibres}},
  author = {Mohammed R. Sharif and Mitchell A. Cox},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.36917},
  eprint = {2609.36917},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.36917},
}
RIS
TY  - UNPB
TI  - Transverse Faraday Effect in Multimode Fibres
AU  - Mohammed R. Sharif
AU  - Mitchell A. Cox
PY  - 2026
DA  - 2026/09/29
PB  - arXiv
DO  - 10.48550/arxiv.2609.36917
UR  - https://arxiv.org/abs/2609.36917
AB  - 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≈ 0.16 for perpendicular input and a complete null for parallel input.
ER  -