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arXiv · 2608.09609

In-situ integrated nonlocal Huygens metasurfaces enable robust vortex beams from multimode fibers

Mingke Jin·Jieyu Zheng·Chaoyang Wang·Yuhao Fang·Gongkai Zhang·Min Qiu·Jingyi Tian
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Abstract

A fundamental hurdle for multimode fiber (MMF) integrated photonics is achieving robust and deterministic wavefront shaping against fiber perturbation, which induces random modal interference and scrambles the real-space output into speckle patterns. Existing wavefront shaping methods typically rely on pixelated phase or polarization pre-compensation, rendering them highly sensitive to fiber deformation. Here, we show that in-situ integration of a silicon nonlocal metasurface onto an MMF end facet enables direct conversion of arbitrary speckle patterns into optical vortex beams without pre-compensation. The metasurface supports overlapped Mie resonances and nonlocal bound states in the continuum (BICs), yielding high-transmission bands by satisfying the generalized nonlocal Huygens condition. Through momentum-space coupling between MMF modes and Huygens-BICs with topological polarization-vortex nature, the output maintains doughnut-shaped profiles under static and dynamic perturbations, demonstrating exceptional robustness against fiber deformation. This approach provides a compact, alignment-tolerant platform for robust structured light generation in MMFs for endoscopy, optical trapping and communications.

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Mingke Jin, Jieyu Zheng, Chaoyang Wang, Yuhao Fang, Gongkai Zhang, Min Qiu, Jingyi Tian. 2026-08-10. In-situ integrated nonlocal Huygens metasurfaces enable robust vortex beams from multimode fibers. https://arxiv.org/abs/2608.09609

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