Annular phase grating-assisted recording of an ultrahigh-order optical orbital angular momentum
Ultrahigh-order optical orbital angular momentum (OAM) states of the identification over ±270 orders are implemented by annular phase grating (APG) and Gaussian beams with different wavelengths. Particularly, the far-field diffraction intensity patterns feature the spiral stripes instead of Hermitian-Gaussian (HG)-like fringes. It’s worth noting that the spiral stripes present uniform distribution, thus the order of OAM states can be intuitively acquired. More specifically, the OAM states can be confirmed from the total amount and rotating direction of the spiral stripes. Compared with traditional methods, the propose scheme contributes to the perfect-distributed and sharper spiral stripes. Moreover, it also makes an easier observation of the patterns in the CCD camera with limited imaging targets. In our experimental setup, the optical filter is removed and the APG parameters are not strictly required. Therefore, the propose optical transmission system is equipped with the advantages of efficiency, robustness and low cost, which paves a promising way for the communication capacity enhancement.
National Natural Science Foundation of China;National Natural Science Foundation of China;National Natural Science Foundation of China;Central South University[CZZ22001];
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|Document Type||Journal Article|
|Department||College of Engineering|
1.Hubei Key Laboratory of Intelligent Wireless Communications,College of Electronics and Information Engineering,South-Central Minzu University,Wuhan,430074,China
2.College of Engineering,Department of Electrical and Electronic Engineering,Southern University of Science and Technology,Shenzhen,518055,China
Ni，Wenjun,Liu，Rui,Yang，Chunyong,et al. Annular phase grating-assisted recording of an ultrahigh-order optical orbital angular momentum[J]. Optics Express,2022,30(21):37526-37535.
Ni，Wenjun.,Liu，Rui.,Yang，Chunyong.,Tian，Yongsheng.,Hou，Jin.,...&Chen，Shaoping.(2022).Annular phase grating-assisted recording of an ultrahigh-order optical orbital angular momentum.Optics Express,30(21),37526-37535.
Ni，Wenjun,et al."Annular phase grating-assisted recording of an ultrahigh-order optical orbital angular momentum".Optics Express 30.21(2022):37526-37535.
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