Capability of topological charge-based orthogonal zone plate in generating sharp focal spot and ring-like beam

Capability of topological charge-based orthogonal zone plate in generating sharp focal spot and... We aim to present an orthogonal symmetric-based diffractive lens which has unique focusing properties. Structure of the element is based on the framework of orthogonal zone plate which is constructed by overlaying two perpendicular linear zone plates with opposite topological charges. We illustrate that the proposed element has sharper focal spot as well as longer focal depth than square and circular zone plate. Apart from having smaller spot size, it also generates a ring-like pattern at a given distance from the focus which depends on topological charge. Maintaining its shape in a distance equal to focal depth may be considered as an interesting feature of the generated annular beam. It is also demonstrated that numerical simulations are verified by experiments. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Optical and Quantum Electronics Springer Journals

Capability of topological charge-based orthogonal zone plate in generating sharp focal spot and ring-like beam

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Publisher
Springer US
Copyright
Copyright © 2017 by Springer Science+Business Media, LLC
Subject
Physics; Optics, Lasers, Photonics, Optical Devices; Electrical Engineering; Characterization and Evaluation of Materials; Computer Communication Networks
ISSN
0306-8919
eISSN
1572-817X
D.O.I.
10.1007/s11082-017-1100-x
Publisher site
See Article on Publisher Site

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