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arXiv · 2504.01725

Brillouin-enhanced four-wave mixing with optical chiral states

Xinglin Zeng·Birgit Stiller
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Abstract

Brillouin-enhanced four-wave mixing - also known as Brillouin dynamic gratings - is an important nonlinear effect in photonics that couples four light waves by travelling acoustic waves. The effect has received a lot of attention in the last few decades, especially for applications in fiber sensing, signal processing and optical delay lines. Here, we report Brillouin-enhanced four-wave mixing with optical chiral states (i.e. circular polarization and vortex states) in twisted photonic crystal fiber, by leveraging the topology-selective Brillouin effect. Phase-matching has the consequence that the travelling acoustic gratings created by circularly-polarized vortex pump and Stokes in the stimulated Brillouin scattering can be used to modulate a frequency-shifted probe, where the pump/Stokes and probe have different circular polarization or topological charges. We demonstrate cross-frequency selective information transfer and show that the information is transferred only when pump and probe have opposite circular polarization.

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Xinglin Zeng, Birgit Stiller. 2025-04-02. Brillouin-enhanced four-wave mixing with optical chiral states. https://arxiv.org/abs/2504.01725

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