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Broadband Multichannel Cylindrical Vector Beam Generation by a Single Metasurface
Laser & Photonics Reviews ( IF 11.0 ) Pub Date : 2022-07-03 , DOI: 10.1002/lpor.202200206
Dandan Wen 1, 2 , Kai Pan 1 , Jiajun Meng 2, 3 , Xuanguang Wu 1 , Xuyue Guo 1 , Peng Li 1 , Sheng Liu 1 , Dong Li 1 , Bingyan Wei 1 , Xin Xie 1 , Dexing Yang 1 , Jianlin Zhao 1 , Kenneth B. Crozier 2, 3
Affiliation  

Beams with spatially-varying polarization states have been the topic of much interest recently due to the unusual ways in which they can interact with matter. Cylindrical vector beams (CVBs) represent the most commonly used type and feature cylindrically-symmetric polarization distributions. The optical systems employed thus far for their generation have usually only been able to produce a single CVB. To generate and observe multiple CVBs, bulky optical systems with stringent alignment tolerances have been needed. Here, a method to generate an array of CVBs using a single optical element, namely a transmission-mode dielectric metasurface, is demonstrated. The incident light is split into an array of left and right-handed circularly polarized vortex beams that superpose with a controllable phase difference. An array of CVBs with 12 channels over a broad wavelength range is experimentally demonstrated. This study's method produces a significant increase in the number of polarization channels compared to previous reports and solves the long-standing challenge of unequal intensity distributions. It furthermore improves the flexibility of the vector field control by not only generating CVBs of different orders but also controlling their polarization rotation. This method may pave the way for applications in optical communications, laser machining, and optical trapping.

中文翻译:

通过单个超表面生成宽带多通道圆柱矢量光束

具有空间变化偏振态的光束最近一直是人们非常感兴趣的话题,因为它们可以与物质相互作用的不同寻常的方式。圆柱矢量光束 (CVB) 是最常用的类型,具有圆柱对称偏振分布。迄今为止,用于生成它们的光学系统通常只能产生单个 CVB。为了生成和观察多个 CVB,需要具有严格对准公差的庞大光学系统。在这里,演示了一种使用单个光学元件(即传输模式介电超表面)生成 CVB 阵列的方法。入射光被分成左旋和右旋圆偏振涡旋光束阵列,这些光束以可控的相位差叠加。实验证明了在宽波长范围内具有 12 个通道的 CVB 阵列。与以前的报告相比,本研究的方法显着增加了偏振通道的数量,并解决了强度分布不均的长期挑战。它进一步提高了矢量场控制的灵活性,不仅可以生成不同阶的 CVB,还可以控制它们的偏振旋转。这种方法可以为光通信、激光加工和光阱中的应用铺平道路。它进一步提高了矢量场控制的灵活性,不仅可以生成不同阶的 CVB,还可以控制它们的偏振旋转。这种方法可以为光通信、激光加工和光阱中的应用铺平道路。它进一步提高了矢量场控制的灵活性,不仅可以生成不同阶的 CVB,还可以控制它们的偏振旋转。这种方法可以为光通信、激光加工和光阱中的应用铺平道路。
更新日期:2022-07-03
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