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arXiv · 2606.15302

Imaginary Poynting momentum driven particle bidirectional rotation along arbitrary trajectory

Lifang Zhao·Xue Yun·Yansheng Liang·Ming Lei
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Abstract

Research on optical rotational manipulation leveraging the imaginary Poynting momentum (IPM) force has predominantly centered on cylindrically polarized Gaussian and annular beams. Here, we extend this framework to tightly focused cylindrically polarized structured light fields possessing closed or open arbitrary-intensity trajectories. We systematically elucidate the rotational dynamics induced by IPM in such fields, characterizing the underlying mechanical effects and trapping flexibilities. Notably, despite carrying zero net angular momentum, these fields drive microparticles into bidirectional rotation along predefined trajectories, thereby challenging conventional paradigms reliant on spin or orbital angular momentum. This IPM-mediated optical spanner offers unprecedented spatial degrees of freedom, paving the way for high-precision optical manipulation along arbitrarily tailored paths.

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Lifang Zhao, Xue Yun, Yansheng Liang, Ming Lei. 2026-06-13. Imaginary Poynting momentum driven particle bidirectional rotation along arbitrary trajectory. https://arxiv.org/abs/2606.15302

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