Wang Yulong, Min Changjun, Zhang Yuquan, Feng Fu, Si Guangyuan, Li Ling, Yuan Xiaocong
Nanophotonics Research Center, Shenzhen Key Laboratory of Micro-Scale Optical Information Technology, Shenzhen University, Shenzhen 518060, China.
Songshan Lake Materials Laboratory, Dongguan 523808, China.
Nanophotonics. 2021 Sep 3;11(9):1969-1976. doi: 10.1515/nanoph-2021-0308. eCollection 2022 Apr.
The ability to draw a structured surface plasmon polariton (SPP) field is an important step toward many new opportunities for a broad range of nanophotonic applications. Previous methods usually require complex experimental systems or holographic optimization algorithms that limit their practical applications. Here, we propose a simple method for flexible generation of structured SPP field with on-chip plasmonic metalenses. The metalens is composed of multiple plasmonic focusing nanostructures whose focal shape and position can be independently manipulated, and through their superposition, SPP fields with specially designed patterns are obtained. Based on this method, we demonstrate several structured SPP fields including S- and W-shaped SPP focal fields and tunable SPP bottle beams. This work could provide new ideas for on-chip manipulation of optical surface waves, and contribute to applications such as on-chip photonic information processing and integrated photonic circuits.
绘制结构化表面等离激元极化激元（SPP）场的能力是迈向众多新型纳米光子学应用新机遇的重要一步。以往的方法通常需要复杂的实验系统或全息优化算法，这限制了它们的实际应用。在此，我们提出一种利用片上等离子体超构透镜灵活生成结构化SPP场的简单方法。该超构透镜由多个等离子体聚焦纳米结构组成，其焦点形状和位置可独立操控，通过它们的叠加，可获得具有特殊设计图案的SPP场。基于此方法，我们展示了几种结构化SPP场，包括S形和W形SPP焦场以及可调谐SPP瓶形光束。这项工作可为光学表面波的片上操控提供新思路，并有助于诸如片上光子信息处理和集成光子电路等应用。
