Vogliardi Andrea, Ruffato Gianluca, Bonaldo Daniele, Dal Zilio Simone, Romanato Filippo
Department of Physics and Astronomy 'G. Galilei', University of Padova, via Marzolo 8, 35131, Padova, Italy.
Department of Information Engineering, University of Padova, via Gradenigo 6, 35131, Padova, Italy.
Nanophotonics. 2023 Oct 30;12(22):4215-4228. doi: 10.1515/nanoph-2023-0555. eCollection 2023 Nov.
Perfect vortices, whose ring profile is independent of the topological charge, play a key role in telecommunications and particle micro-manipulation. In this work, we report the compact generation of a new kind of double-ring perfect vortices, called double-ring perfect vector beams, by exploiting dual-functional silicon metaoptics. In particular, we develop and test a new paradigm to generate those beams with the possibility of selecting different topological charges between the two rings. The generated beams are characterized through a filtering method, proving that the two rings have a vectorial nature with the same magnitude and either the same or different topological charges. Their unique properties suggest promising applications for optical tweezing and manipulation of low refractive-index particles, trapping of cold atoms, and high-capacity communications.
完美涡旋，其环形轮廓与拓扑电荷无关，在电信和粒子微操纵中起着关键作用。在这项工作中，我们报告了通过利用双功能硅超光学器件紧凑地产生一种新型的双环完美涡旋，即双环完美矢量光束。特别是，我们开发并测试了一种新的范例来产生这些光束，该范例能够在两个环之间选择不同的拓扑电荷。通过一种滤波方法对所产生的光束进行了表征，证明这两个环具有相同大小且拓扑电荷相同或不同的矢量性质。它们的独特性质表明在光学镊子和低折射率粒子操纵、冷原子捕获以及高容量通信方面具有广阔的应用前景。
