Intrinsic Angular Momentum Contribution to the Sagnac Response of a Rotating Helical Optical Fiber
Year: 2026
Type: preprint
Abstract: 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.
Source: arXiv (Cornell University)
Authors: Yang, Lili, Zhang, Pengming, Feng, Longlong
Institution: Sun Yat-sen University
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Awards: G1302261166, G3733905972, G7637131471
OpenAlex ID: W7223368300