Off-axis points encoding/decoding with orbital angular momentum spectrum
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Peer-reviewed
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Abstract
Encoding/decoding off-axis points with discrete orbital angular momentum (OAM) modes is investigated. On-axis Laguerre-Gaussian (LG) beams are expanded into off-axis OAM spectra, with which off-axis points are encoded. The influence of the mode and the displacement of the LG beam on the spread of the OAM spectrum is analysed. The results show that not only the conventional on-axis point, but also off-axis points, can be encoded and decoded with OAM of light. This is confirmed experimentally. The analytical result here provides a solid foundation to use OAM modes to encode two-dimensional high density information for multiplexing and to analyse the effect of mis-alignment in practical OAM applications.
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Keywords
displays, fibre optics and optical communications
Journal Title
Scientific Reports
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Journal ISSN
2045-2322
2045-2322
2045-2322
Volume Title
7
Publisher
Nature Publishing Group
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Engineering and Physical Sciences Research Council (EP/F00897X/1)
This research was performed under a joint collaboration between Disney Research and the University of Cambridge through the CAPE consortium. J.C. and D.C. would like to thank the UK Engineering and Physical Sciences Research Council (EPSRC) for the support through the Platform Grant for Liquid Crystal Photonics (EP/F00897X/1).