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arXiv 2105.04367physics.opticsphysics.app-ph
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基于动态超表面的可切换奇异梁的产生

Generation of Switchable Singular Beams with Dynamic Metasurfaces

Ping Yu, Jianxiong Li, Xin Li, Gisela Schuetz, Michael Hirscher, Shuang Zhang, Na Liu

摘要:

奇异光束由于其独特的光学性质和在光操纵、光通信等领域的广泛应用而受到人们的广泛关注。然而,一直缺乏实用的方案,实现可切换的奇异光束与亚波长分辨率使用的平面和平面光学器件。在这项工作中,我们演示了在可见光频率下利用动态超颖表面产生可切换的矢量和涡旋光束。超颖表面像素的动态功能通过利用镁纳米棒来实现,镁纳米棒在氢化和脱氢时具有等离子体可重构性。我们发现,不同偏振态的可切换矢量光束和不同拓扑电荷的可切换涡旋光束可以通过简单的氢化和脱氢相同的超颖表面来实现。此外,我们展示了一个两个级联的超颖表面计划全息图案切换,从轨道角动量键控的灵感。我们的工作为开发用于防伪应用的高安全性光学元件提供了额外的自由度。

英文摘要:

Singular beams have attracted great attention due to their optical properties and broad applications from light manipulation to optical communications. However, there has been a lack of practical schemes with which to achieve switchable singular beams with sub-wavelength resolution using ultrathin and flat optical devices. In this work, we demonstrate the generation of switchable vector and vortex beams utilizing dynamic metasurfaces at visible frequencies. The dynamic functionality of the metasurface pixels is enabled by the utilization of magnesium nanorods, which possess plasmonic reconfigurability upon hydrogenation and dehydrogenation. We show that switchable vector beams of different polarization states and switchable vortex beams of different topological charges can be implemented through simple hydrogenation and dehydrogenation of the same metasurfaces. Furthermore, we demonstrate a two-cascade metasurface scheme for holographic pattern switching, taking inspiration from orbital angular momentum-shift keying. Our work provides an additional degree of freedom to develop high-security optical elements for anti-counterfeiting applications.

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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