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arXiv 1409.3547physics.optics
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利用超表面产生强纵向极化磁场涡旋光束

Generation of Vortex Beams with Strong Longitudinally Polarized Magnetic Field by Using a Metasurface

Mehdi Veysi, Caner Guclu, Filippo Capolino

摘要:

提出了一种产生和合成方位E偏振涡旋光束的新方法。沿着传播轴,这种光束具有强的纵向极化磁场,而理想情况下没有电场。我们展示了如何通过拉盖尔-高斯光束进行轨道角动量的干涉来构造这些光束。作为一个例子,我们提出了一个元表面的双分裂环槽对,并报告模拟和分析结果之间的良好协议。实现了高的磁场-电场对比度和磁场增强。我们还研究了将线偏振光束转换为方位E偏振光束的超颖表面物理约束,并表征了真实超颖表面的磁场增强和电场抑制性能。这些研究结果是潜在的有用的新的光学光谱相关的磁偶极跃迁和光学操纵的粒子与自旋和轨道角动量。

英文摘要:

A novel method of generation and synthesis of azimuthally E-polarized vortex beams is presented. Along the axis of propagation such beams have a strong longitudinally polarized magnetic field where ideally there is no electric field. We show how these beams can be constructed through the interference of Laguerre-Gaussian beams carrying orbital angular momentum. As an example, we present a metasurface made of double-split ring slot pairs and report a good agreement between simulated and analytical results. Both a high magnetic-to-electric-field contrast ratio and a magnetic field enhancement are achieved. We also investigate the metasurface physical constraints to convert a linearly polarized beam into an azimuthally E- polarized beam and characterize the performance of magnetic field enhancement and electric field suppression of a realistic metasurface. These findings are potentially useful for novel optical spectroscopy related to magnetic dipolar transitions and for optical manipulation of particles with spin and orbital angular momentum.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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