Wang Yu, Zhao Peng, Feng Xue, Xu Yuntao, Cui Kaiyu, Liu Fang, Zhang Wei, Huang Yidong
Department of Electronic Engineering, Tsinghua National Laboratory for Information Science and Technology, Tsinghua University, Beijing, China.
Sci Rep. 2016 Mar 3;6:22512. doi: 10.1038/srep22512.
Due to the nature of infinite dimensionality, the orbital angular momentum (OAM) has been considered as a new degree of freedom of light and widely expanded the scopes of substantial optical applications such as optical telecommunication, quantum information, particle manipulation and imaging. In recent years, the integrated photonic OAM emitters have been actively investigated due to both compactness and tunability. Essentially, the number of available OAM modes by dynamic switching should be large enough so that the dimensionality of OAM could be explored as much as possible. In this work, an integrated photonic emitter with a wide switching range of OAM modes is theoretically developed, numerically simulated, and experimentally verified. The independence of the micro-ring cavity and the scattering unit provides the flexibility to design the device and optimize the performance. Specifically, the dynamic switching of nine OAM modes (l = -4 ~ 4) with azimuthal polarization has been demonstrated by electrically controlled thermo-optic effect.
由于无限维的特性，轨道角动量（OAM）被视为光的一种新的自由度，并广泛拓展了诸如光通信、量子信息、粒子操控和成像等大量光学应用的范围。近年来，集成光子OAM发射器因其紧凑性和可调性而受到积极研究。从本质上讲，通过动态切换可获得的OAM模式数量应足够大，以便尽可能多地探索OAM的维度。在这项工作中，理论上开发、数值模拟并实验验证了一种具有宽OAM模式切换范围的集成光子发射器。微环腔和散射单元的独立性为器件设计和性能优化提供了灵活性。具体而言，通过电控热光效应演示了具有方位角偏振的九种OAM模式（l = -4至4）的动态切换。
