Fu Dongzhi, Zhou Yiyu, Qi Rui, Oliver Stone, Wang Yunlong, Rafsanjani Seyed Mohammad Hashemi, Zhao Jiapeng, Mirhosseini Mohammad, Shi Zhimin, Zhang Pei, Boyd Robert W
Opt Express. 2018 Dec 10;26(25):33057-33065. doi: 10.1364/OE.26.033057.
The transverse structure of light is recognized as a resource that can be used to encode information onto photons and has been shown to be useful to enhance communication capacity as well as resolve point sources in superresolution imaging. The Laguerre-Gaussian (LG) modes form a complete and orthonormal basis set and are described by a radial index p and an orbital angular momentum (OAM) index ℓ. Earlier works have shown how to build a sorter for the radial index p or/and the OAM index ℓ of LG modes, but a scalable and dedicated LG mode sorter which simultaneous determinate p and ℓ is immature. Here we propose and experimentally demonstrate a scheme to accomplish complete LG mode sorting, which consists of a novel, robust radial mode sorter that can be used to couple radial modes to polarizations, an ℓ-dependent phase shifter and an OAM mode sorter. Our scheme is in principle efficient, scalable, and crosstalk-free, and therefore has potential for applications in optical communications, quantum information technology, superresolution imaging, and fiber optics.
光的横向结构被认为是一种可用于将信息编码到光子上的资源，并且已被证明有助于提高通信容量以及在超分辨率成像中分辨点源。拉盖尔 - 高斯（LG）模式构成一个完备且正交归一的基集，并由径向指数p和轨道角动量（OAM）指数ℓ描述。早期的工作已经展示了如何构建用于LG模式的径向指数p或/和OAM指数ℓ的分选器，但一种能够同时确定p和ℓ的可扩展且专用的LG模式分选器尚不成熟。在此，我们提出并通过实验证明了一种实现完整LG模式分选的方案，该方案由一种新颖、稳健的可用于将径向模式耦合到偏振的径向模式分选器、一个与ℓ相关的移相器和一个OAM模式分选器组成。我们的方案原则上是高效、可扩展且无串扰的，因此在光通信、量子信息技术、超分辨率成像和光纤光学等领域具有应用潜力。
