Compact, low-cost, and low-crosstalk orbital angular momentum sorter based on binary grating

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2 Scopus citations

Abstract

This paper demonstrates the design, fabrication, and testing of a compact, low-cost, low-crosstalk orbital angular momentum (OAM) sorter. The sorter is based on optical geometric transformation (OGT). This sorter can realize the separation of the OAM states as the traditional sorter, but uses a compact design that utilizes only two phase modulations to realize the transformation and focus. The phase modulations are introduced by distorting the binary gratings by curving the geometrical structure rather than optical path difference. The fabrication is simple and only needs single-step lithography and single-step dry etching on a fused quartz plate. The etching depth error does not affect the sorting result but only the diffraction efficiency. In the experiment, the two binary gratings are fabricated on the same substrate to lower the degrees of freedom of alignment and ensure uniform etching depth. The sorter is further improved by incorporating fan-out diffraction, resulting in a higher separation and lower cross-talk. This sorter can provide a compact, low-cost, low-crosstalk device to realize OAM demultiplexing.
Original languageEnglish (US)
Pages (from-to)109744
JournalOptics and Laser Technology
Volume167
DOIs
StatePublished - Jun 28 2023

Bibliographical note

KAUST Repository Item: Exported on 2023-07-17
Acknowledged KAUST grant number(s): BAS/1/1614-01-01, OSR-CRG2017-3417
Acknowledgements: This work was supported by Guangdong Basic and Applied Basic Research Foundation (2022A1515110496), King Abdullah University of Science and Technology (BAS/1/1614-01-01, OSR-CRG2017-3417), Natural Science Foundation of Guangdong Province (2023A1515011441, 2022A1515140118), and the Great Bay University Scientific Research Start-up Funding (No. YJKY220005). S. Zheng thanks Qingdao municipal bureau of human resources and social security for the support in recovering of unpaid wages.

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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