Abstract
In view of wide applications of structured light fields and plasmonic vortices, we propose the concept of compound plasmonic vortex and design several structured plasmonic vortex generators. This kind of structured plasmonic vortex generators consists of multiple spiral nanoslits and they can generate two or more concentric plasmonic vortices. Different from Laguerre-Gaussian beam, the topological charge of the plasmonic vortex in different region is different. Theoretical analysis lays the basis for the design of radially structured plasmonic vortex generators and numerical simulations for several examples confirm the effectiveness of the design principle. The discussions about the interference of vortex fields definite the generation condition for the structured vortex. This work provides a design methodology for generating new vortices using spiral nanoslits and the advanced radially structured plasmonic vortices is helpful for broadening the applications of vortex fields.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (NSFC) (Grant Nos. 10874105 and 11704231).
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arXiv: 2012.03271. This article can also be found at http://journal.hep.com.cn/fop/EN/https://doi.org/10.1007/s11467-020-1032-y.
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Zhou, CD., Mou, Z., Bao, R. et al. Compound plasmonic vortex generation based on spiral nanoslits. Front. Phys. 16, 33503 (2021). https://doi.org/10.1007/s11467-020-1032-y
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DOI: https://doi.org/10.1007/s11467-020-1032-y