Near‐Zero‐Sidelobe Optical Subwavelength Asymmetric Focusing Lens with Dual‐Layer Metasurfaces,Annalen Der Physik

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Near‐Zero‐Sidelobe Optical Subwavelength Asymmetric Focusing Lens with Dual‐Layer Metasurfaces
Annalen Der Physik ( IF 2.2 ) Pub Date : 2020-06-10 , DOI: 10.1002/andp.202000035
Jianlan Xie ₁ , Shengnan Liang ₂ , Jianjun Liu ₁ , Pinghua Tang ₂ , Shuangchun Wen ₁

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Existing metasurfaces with ultrathin volume for asymmetric transmission are often constructed from metal with low efficiency in optical frequencies, and cannot realize optical asymmetric transmission and focusing simultaneously. Although acoustic asymmetric focusing in asymmetric focusing lenses (AFL) has been realized, the obtained focal point is accompanied by a large sidelobe. To solve these problems, an AFL with dual‐layer metasurfaces designed by using impedance matching materials can realize optical asymmetric transmission and focusing simultaneously in this paper. Furthermore, through optimizing the design theory of AFL, near‐zero‐sidelobe (NZS) focusing can be realized on the subwavelength scale. NZS asymmetric focusing of the optimized AFL is effective in broadband, which is expected to show tremendous potential in optical micro‐nanoprocessing, quantum communication, optical micromanipulation, etc.

中文翻译：

具有双层超颖表面的近零西德罗贝光学亚波长非对称聚焦透镜

现有的用于非对称传输的超薄体积超表面通常是由金属制成的，其光频率效率很低，并且无法同时实现光学非对称传输和聚焦。尽管已经实现了非对称聚焦透镜（AFL）中的声学非对称聚焦，但是获得的焦点伴随着较大的旁瓣。为了解决这些问题，通过使用阻抗匹配材料设计的具有双层超颖表面的AFL可以实现光学不对称传输和同时聚焦。此外，通过优化AFL的设计理论，可以在亚波长范围内实现近零旁瓣（NZS）聚焦。NZS经过优化的AFL的非对称聚焦在宽带中非常有效，

更新日期：2020-06-10

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