On‐Demand Mode Conversion and Wavefront Shaping via On‐Chip Metasurfaces
On‐Demand Mode Conversion and Wavefront Shaping via On‐Chip Metasurfaces
复制标题
DOI：
10.1002/adom.202200910
复制
发表时间：
2022-09
影响因子：
9
通讯作者：
Lin Deng;Yihao Xu;Ren-chao Jin;Ziqiang Cai;Yongmin Liu
中科院分区：
文献类型：
--
作者：
Lin Deng;Yihao Xu;Ren-chao Jin;Ziqiang Cai;Yongmin Liu
在这项工作中，模式转换和波前整形集成金属超颖表面上的平面波导的顶部提出和证明。超表面由C形纳米天线组成。通过控制每个纳米天线的取向，实现波导内交叉极化电场的模式转换和聚焦效果。报道了16种宽带横磁-横电模式转换器的设计和仿真结果，其模式纯度高达98%，并在1550 nm波长下实现了片上透镜。值得注意的是，器件沿传播方向的尺寸沿着仅为9.6 µm。这项工作体现了基于超表面的模分复用系统和片上光互连的潜在应用。
In this work, mode conversion and wavefront shaping by integrating a metallic metasurface on top of a planar waveguide are proposed and demonstrated. The metasurface consists of C‐shaped nanoantennas. By controlling the orientation of each nanoantenna, mode conversion and focusing effect for the cross‐polarized electric fields inside the waveguide are achieved. The design and simulation results of 16 scenarios of wideband transverse‐magnetic to transverse‐electric mode converters with the mode purity up to 98%, and on‐chip lenses at the wavelength of 1550 nm are reported. It is worth noting that the dimension of the devices along the propagation direction is only 9.6 µm. This work manifests the potential application of mode division multiplexing systems and on‐chip optical interconnections based on metasurfaces.