Arbitrary spatial mode sorting in a multimode fiber
Arbitrary spatial mode sorting in a multimode fiber
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DOI：
10.1103/physreva.101.063830
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发表时间：
2020-04
影响因子：
2.9
通讯作者：
H. Defienne;D. Faccio
中科院分区：
文献类型：
--
作者：
H. Defienne;D. Faccio
从超分辨率成像到高维量子密钥分发，空间光学模式的分类是支撑许多应用的关键挑战。然而，迄今为止，光学模式分选器的实现仅在特定的模式集上运行，例如那些携带轨道角动量的模式，因此在任意空间基础上的操作方面缺乏通用性。在这里，我们通过波前整形利用光在多模光纤中传播过程中发生的随机模式混合过程来演示任意空间模式分选器。通过测量光纤的传输矩阵，我们展示了高达$25$的傅里叶，拉盖尔-高斯和随机基的横向空间模式的排序到输出端的任意位置集。我们的方法提供了一种紧凑、易于制造、可编程和可用于任何空间基的空间模式分选器，这对量子和经典信息科学很有希望。
Sorting spatial optical modes is a key challenge that underpins many applications from super-resolved imaging to high-dimensional quantum key distribution. However, to date implementations of optical mode sorters only operate on specific sets of modes, such as those carrying orbital angular momentum, and therefore lack versatility with respect to operation with an arbitrary spatial basis. Here, we demonstrate an arbitrary spatial mode sorter by harnessing the random mode mixing process occurring during light propagation in a multimode fibre by wavefront shaping. By measuring the transmission matrix of the fibre, we show sorting of up to $25$ transverse spatial modes of the Fourier, Laguerre-Gaussian and a random basis to an arbitrary set of positions at the output. Our approach provides a spatial mode sorter that is compact, easy-to-fabricate, programmable and usable with any spatial basis, which is promising for quantum and classical information science.