Paper

Abruptly autofocusing beams generated with multiple Bessel-like beams

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Published 18 February 2016 © 2016 IOP Publishing Ltd
, , Citation Juanying Zhao et al 2016 J. Opt. 18 035601 DOI 10.1088/2040-8978/18/3/035601

2040-8986/18/3/035601

Abstract

We numerically and experimentally generate a type of autofocusing beam that is combined from multiple Bessel-like beams. The beams are combined from two- and four-component Bessel-like beams. We demonstrate that the intensity of these beams can suddenly increase by orders of magnitude right before the target. With infinite components, the combined beams have a smaller focal spot, a longer focal length, and can morph into nondiffracting Bessel beams in their far field. Through numerical simulation comparisons of the propagation dynamics of these beams with those of other combined beams, it can be seen that these beams exhibit better focusing features.

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