Spiral Transformation for High-Resolution and Efficient Sorting of Optical Vortex Modes

Wen, Yuanhui, Chremmos, Ioannis, Chen, Yujie, Zhu, Jiangbo, Zhang, Yanfeng and Yu, Siyuan (2018) Spiral Transformation for High-Resolution and Efficient Sorting of Optical Vortex Modes. Physical Review Letters, 120 (19). p. 193904. ISSN 0031-9007

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Official URL: https://doi.org/10.1103/PhysRevLett.120.193904

Abstract

Mode sorting is an essential function for optical multiplexing systems that exploit the orthogonality of the orbital angular momentum mode space. The familiar log-polar optical transformation provides a simple yet efficient approach whose resolution is, however, restricted by a considerable overlap between adjacent modes resulting from the limited excursion of the phase along a complete circle around the optical vortex axis. We propose and experimentally verify a new optical transformation that maps spirals (instead of concentric circles) to parallel lines. As the phase excursion along a spiral in the wave front of an optical vortex is theoretically unlimited, this new optical transformation can separate orbital angular momentum modes with superior resolution while maintaining unity efficiency.

Item Type: Article
Subjects: F300 Physics
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: John Coen
Date Deposited: 01 Jun 2020 12:46
Last Modified: 01 Jun 2020 13:00
URI: http://nrl.northumbria.ac.uk/id/eprint/43282

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