基于高阶复合相调制的高效率和宽带不对称的旋转轨道相互作用
Yuzhong Ou1,2, Yan Chen1,2, Fei Zhang1,2
1National Key Laboratory of Optical Field Manipulation Science and Technology, Chinese Academy of Sciences, State Key Laboratory of Optical Technologies on Nano-Fabrication and Micro-Engineering, Institute of Optics and Electronics, Chengdu 610209, China.
Nanophotonics (Berlin, Germany)
|December 5, 2024
概括
研究人员使用旋转对称的元原子实现了高效非对称旋转轨道相互作用 (ASOI). 这一突破使宽带,高性能旋转脱元器件用于先进的光学应用.
科学领域:
- 光学和光子学 在光学和光子学.
- 超材料是什么?超材料是什么?
- 纳米技术 纳米技术
背景情况:
- 传统的几何相位元面受结合对称性限制,阻碍了诸如自旋脱全息等应用.
- 现有的不对称旋转轨道相互作用 (ASOI) 方法依赖于C1/C2对称元原子,往往导致由于传播阶段控制而导致效率损失.
- 对旋转轨道相互作用来说,异位性至关重要,但在超表面中有效地实现它仍然是一个挑战.
研究的目的:
- 为了证明3级或更高 (≥3) 的旋转对称度的元原子的不对称旋转轨道相互作用 (ASOI).
- 通过将通用几何相与传播相相结合起来,克服传统元表面的效率限制.
- 为了开发高效率,宽带旋转脱的元设备.
主要方法:
- 使用旋转对称性≥3的元原子 (特别是C3) 在全金属配置中.
- 将通用几何相与传播相结合起来,以实现ASOI.
- 设计和制造自旋脱光束衍射器和全息图元器件.
主要成果:
- 通过使用C3元原子在宽带波长范围 (9.3-10.6μm) 上使用自旋脱光束衍射器,实现了~84%的平均衍射效率.
- 由于晶格合效应,与C2元原子相比,显著提高了效率,这种效应对传播阶段控制不那么敏感.
- 在宽带频谱上实验验验证了自旋脱光束衍射器和全息图元器件的性能.
结论:
- 在旋转对称率≥3的元原子中,通过整合通用几何和传播相,可以有效实现ASOI.
- 拟议的C3超表面设计为高效率,宽带旋转脱的元设备提供了一条新的途径,超越了传统C2设计的局限性.
- 这项研究为先进的光学应用开辟了新的途径,利用自旋依赖光操纵.
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