Realization of a scalable Laguerre–Gaussian mode sorter based on a robust radial mode sorter

Dongzhi Fu, Yiyu Zhou, Rui Qi, Stone Oliver, Yunlong Wang, Seyed Mohammad Hashemi Rafsanjani, Jiapeng Zhao, Mohammad Mirhosseini, Zhimin Shi, Pei Zhang, Robert W. Boyd

Research output: Contribution to journalArticlepeer-review

23 Scopus citations


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 `. Earlier works have shown how to build a sorter for the radial index p or/and the OAM index ` of LG modes, but a scalable and dedicated LG mode sorter which simultaneous determinate p and ` 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 `-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.

Original languageEnglish (US)
Pages (from-to)33057-33065
Number of pages9
JournalOptics Express
Issue number25
StatePublished - Dec 10 2018
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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