Fiber-guided modes conversion using superposed helical gratings

Ma, Yancheng; Fang, Liang; Wu, Guorong

doi:10.1016/j.optcom.2016.11.007

Cited by 7 publications

(2 citation statements)

References 26 publications

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“…These even and odd vector modes have the same propagation constant in the circularly symmetric optical fibers [34]. In general, fiber-guided OAM modes are formed by this mode superposition [34,35,[69][70][71]. Additionally, as a specific kind of helical fibers, the helical or twisted core optical fibers can intrinsically excite and convert the OAM modes [72][73][74].…”

Section: Calculation and Verificationmentioning

confidence: 99%

“…It is well known that in weakly guiding approximation (low index contrast between fiber core and cladding), the eigenmodes degenerate into the common linearly polarized (LP) modes in FMFs. The eigen vector modes or LP modes are usually considered as modal basis of fiber-guided optical vortex that carries orbital angular momentum (OAM), and vice versa [34,35]. Actually, the SOI of light in FMFs could be indirectly observed through the reflection peaks splitting off fiber Bragg gratings (FBGs) [36] or the length-dependent spincontrolled pattern rotation [37], but both on the condition of eigenmode splitting or modal degeneracy lifting for the welldesigned strongly guiding fibers.…”

Section: Introductionmentioning

confidence: 99%

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From Imbert–Fedorov shift to topologically spin-dependent walking off for highly confining fiber-guided twisted light

Fang¹,

Wang²

2021

J. Opt.

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Light–matter interaction at dielectric interfaces usually manifests as spin-dependent correction to light propagation, known as classical Imbert–Fedorov (IF) shift or photonic spin Hall effect, ruled by the general spin–orbit interaction (SOI) of light. Even though vector wave equations and strong SOI-based perturbation theory in a wave picture can offer good solutions to describe the modal dispersion in optical fibers, it is difficult for all these to provide an intuitive insight into the walking off for twisted (or vortex) light beams carrying orbital angular momentum (OAM). Here we present a new perspective to the topologically spin-dependent modal splitting for the twisted light highly confined in optical fibers based on the classical IF shift on geometric optics. We verify this topologically IF-shift-based walking off by comparing the analytical results of modal splitting degrees with the solutions of eigen equation, and associate the longitudinal projection of IF shift with an interesting resonance of fiber Bragg gratings locked by the signs of SAM or OAM. This interpretation provides an insight supplement to describe light ray propagating in optical fibers together with both longitudinal Goos–Hänchen and transverse IF shift under the total internal reflection, and may benefit the development of nanoscale fiber-based light on optically classical or quantum communication and metrology.

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