Journal
NANOPHOTONICS
Volume 11, Issue 2, Pages 241-273Publisher
WALTER DE GRUYTER GMBH
DOI: 10.1515/nanoph-2021-0616
Keywords
fractional vortex beam; orbital angular momentum; phase step; singular optics; structured light; topological charge jump
Categories
Funding
- National Key Research and Development Program of China [2019YFA0705000]
- National Natural Science Foundation of China [12174280, 11774250, 11974218, 91750201, 12104264, 12192254]
- Innovation Group of Jinan [2018GXRC010]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- Local Science and Technology Development Project of the Central Government [YDZX20203700001766]
- Natural Science Foundation of Shandong Province [ZR2021QA014]
- Tang Scholar
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Fractional vortex beams, as an essential complement to integer vortex beams, possess unique physical properties and have been widely applied in various fields such as micro-particle manipulation, communication, image enhancement, and quantum entanglement. Research in this area has been expanding, leading to a new wave of studies in micro/nano-optical devices.
As an indispensable complement to an integer vortex beam, the fractional vortex beam has unique physical properties such as radially notched intensity distribution, complex phase structure consisting of alternating charge vortex chains, and more sophisticated orbital angular momentum modulation dimension. In recent years, we have noticed that the fractional vortex beam was widely used for complex micro-particle manipulation in optical tweezers, improving communication capacity, controllable edge enhancement of image and quantum entanglement. Moreover, this has stimulated extensive research interest, including the deep digging of the phenomenon and physics based on different advanced beam sources and has led to a new research boom in micro/nano-optical devices. Here, we review the recent advances leading to theoretical models, propagation, generation, measurement, and applications of fractional vortex beams and consider the possible directions and challenges in the future.
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