Zhang Ruirui, Zhang Yuqin, Ma Li, Zeng Xiangyu, Li Xing, Zhan Zijun, Ren Xiaorong, He Changwei, Liu Chunxiang, Cheng Chuanfu
Shandong Provincial Key Laboratory of Optics and Photonic Devices & Shandong Provincial Engineering and Technical Center of Light Manipulations, School of Physics and Electronics, Shandong Normal University, Jinan 250014, China.
Nanoscale. 2019 Aug 7;11(29):14024-14031. doi: 10.1039/c9nr03381e. Epub 2019 Jul 16.
Metasurfaces can be used to manipulate light at the subwavelength scale, and miniaturized photonic devices can be designed to generate subwavelength lattices, which are important for exploring phenomena in novel fields of physics such as topology. Analogous to multi-beam interference, plasmonic metasurfaces composed of nano-slit pairs on truncated spiral segments were designed and fabricated to realize lattice wave fields at a subwavelength resolution. The interference of the analogous beams was controlled by combining the geometric and dynamic phases, and lattices of different morphologies were realized by adjusting the orientation and position of the nano-slits simultaneously. The numerical and measured results showed good agreement, demonstrating the feasibility of the method and its ability to miniaturize lattice patterns. Owing to the compactness and flexible tunability, the nanoscale optical lattices generated using the metasurfaces are expected to find wide applications in integrated and on-chip optical systems.
超表面可用于在亚波长尺度上操纵光，并且可以设计小型化光子器件来生成亚波长晶格，这对于探索拓扑学等新物理领域的现象非常重要。类似于多光束干涉，设计并制造了由截断螺旋段上的纳米狭缝对组成的等离子体超表面，以实现亚波长分辨率的晶格波场。通过结合几何相位和动态相位来控制类似光束的干涉，并通过同时调整纳米狭缝的方向和位置来实现不同形态的晶格。数值结果和测量结果显示出良好的一致性，证明了该方法的可行性及其使晶格图案小型化的能力。由于其紧凑性和灵活的可调性，使用超表面生成的纳米级光学晶格有望在集成和片上光学系统中得到广泛应用。
