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Construction, characteristics, and constraints of accelerating beams based on caustic design

Research output: Contribution to journalArticle

Original languageEnglish
Pages (from-to)32728-32738
Number of pages11
JournalOptics Express
Volume26
Issue number25
Early online date28 Nov 2018
DOIs
DateAccepted/In press - 7 Nov 2018
DateE-pub ahead of print - 28 Nov 2018
DatePublished (current) - 10 Dec 2018

Abstract

Caustic methods have been proposed for wavefront design to enable light beams propagating along curved trajectories, namely accelerating beams. Here we elaborate the complete construction, remarkable characteristics, and hidden constraints of these methods. It is found that accelerating beams based on the caustic design have not only a well-known curved intensity distribution but also a linear phase distribution along the caustic proportional to the curved length, as if light field indeed moved along the caustic. Moreover, with this characteristic, further light-ray analyses are implemented to illustrate the constraints of caustic design in different cases. We expect our work will clarify some confusion on the effectiveness and applicability of caustic methods, and thus facilitate the design of accelerating beams for various applications.

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