Intrinsic Angular Momentum Contribution to the Sagnac Response of a Rotating Helical Optical Fiber

@misc{yang2026intrinsic,
  title = {{Intrinsic Angular Momentum Contribution to the Sagnac Response of a Rotating Helical Optical Fiber}},
  author = {Lili Yang and Pengming Zhang and Longlong Feng},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.30898},
  eprint = {2610.30898},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.30898},
  note = {CC BY 4.0},
}

TY  - UNPB
TI  - Intrinsic Angular Momentum Contribution to the Sagnac Response of a Rotating Helical Optical Fiber
AU  - Lili Yang
AU  - Pengming Zhang
AU  - Longlong Feng
PY  - 2026
DA  - 2026/10/22
PB  - arXiv
DO  - 10.48550/arxiv.2610.30898
UR  - https://arxiv.org/abs/2610.30898
AB  - We investigate rotation-induced phase accumulation of structured light in a mechanically rotating uniform helical optical fiber using a four-component optical Dirac-like equation. In the paraxial and weak-geometry regime, the intrinsic dynamics contain a torsion-induced geometric coupling and a mechanical rotation--angular-momentum coupling. We show that, in a common-path mirror-reflection geometry, both the torsion-induced geometric phase and the conventional area-dependent Sagnac contribution cancel over a complete round trip, whereas the intrinsic rotation--angular-momentum phase survives. The surviving phase depends on the intrinsic total angular momentum of the structured optical mode and provides a common-path interferometric route for probing intrinsic angular momentum effects in rotational sensing.
ER  -