Li Shimao, Yu Wen, Meriggi Laura, Xiao Qingsheng, Nong Zhichao, Cai Xinlun, Sorel Marc, Yu Siyuan
Opt Lett. 2017 Mar 1;42(5):975-978. doi: 10.1364/OL.42.000975.
Integrated devices that emit light beams with orbital angular momentum (OAM) are becoming key components for wide-ranging applications. Here we propose and demonstrate a highly directional silicon photonic vortex beam emitter based on a 3-turn Archimedean spiral adiabatic waveguide integrated with an angular grating. Such a compact emitter is capable of generating vortex beams with small divergence angles and high directivity. Various orders of OAM modes can be selectively generated by the emitter at different wavelengths with a side-mode suppression ratio as large as 13.6 dB.
能够发射具有轨道角动量（OAM）光束的集成器件正成为广泛应用的关键组件。在此，我们提出并展示了一种基于与角光栅集成的三匝阿基米德螺旋绝热波导的高定向硅光子涡旋光束发射器。这种紧凑的发射器能够产生具有小发散角和高方向性的涡旋光束。发射器可以在不同波长下选择性地产生各种阶次的OAM模式，其边模抑制比高达13.6 dB。
