由零折射率超构透镜产生的贝塞尔光束

F. Deng, Zhiwei Guo, Mina Ren, Xiaoqiang Su, L. Dong, Yan Liu, Yun-long Shi, Hong Chen
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引用次数: 2

摘要

贝塞尔光束是一种重要的传播不变性光场。其中心点的大小和形状在远距离传输过程中保持不变,具有广泛的应用前景。本文发现可以设计零折射率介质(ZIM)元透镜来实现独特的贝塞尔光束。一方面,基于亚波长单元胞的金属-介电多层结构,提出了各向异性epsilon-near-zero介质(ENZ)元胞产生鲁棒贝塞尔光束,该光束不受传输路径或结构内部缺陷的影响。ZIM超透镜揭示了ENZ介质提供了一种超越传统凸棱镜产生贝塞尔光束的新方法。另一方面,利用ZIM的均匀场分布,在各向同性ENZ超构透镜中研究了基于多点源(出口面)的增强(多通道)贝塞尔光束。此外,由ZIM超粒子产生的贝塞尔光束也被扩展到用二维光子晶体实现的epsilon-mu近零超材料。我们的研究结果不仅提供了一种基于ZIM超构透镜产生贝塞尔光束的新方法,而且还可以使它们在荧光显微镜成像、粒子捕获和波前裁剪等光学应用中得到应用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
BESSEL BEAM GENERATED BY THE ZERO-INDEX METALENS
Bessel beam is an important propagation-invariant optical field. The size and shape of its central spot remain unchanged in the long-distance transmission process, which has a wide application prospect. In this paper, we find that zero-index media (ZIM) metalen can be designed to realize the unique Bessel beam. On the one hand, based on the metal-dielectric multilayered structure with subwavelength unit cells, the anisotropic epsilon-near-zero media (ENZ) metalen is proposed for generating the robust Bessel beam, which is immune to the defects placed in the transmission path or the inside of the structure. The ZIM metalens uncover that ENZ media provide a new way to generate Bessel beams beyond the conventional convex prisms. On the other hand, with the help of the uniform field distribution of ZIM, enhanced (multi-channel) Bessel beams based on multiple point sources (exit surfaces) are studied in the isotropic ENZ metalens. In addition, the Bessel beam generated by the ZIM metalen has also been extend to the epsilon-mu-near zero metamaterial realized by two-dimensional photonic crystals. Our results not only provide a new way to generate Bessel beam based on the ZIM metalens, but also may enable their use in some optical applications, such as in fluorescence microscopy imaging, particle trapping, and wave-front tailoring.
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