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Open AccessArticle

Strongly Focused Circularly Polarized Optical Vortices Regulated by a Fractal Conical Lens

by Zhirong Liu 1,2,*,†, Kelin Huang 1,†, Anlian Yang 1, Xun Wang 1,* and Philip H. Jones 2
1
Department of Applied Physics, East China Jiaotong University, Nanchang 330013, China
2
Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK
*
Authors to whom correspondence should be addressed.
These authors contributed equally to this work.
Appl. Sci. 2020, 10(1), 28; https://doi.org/10.3390/app10010028
Received: 30 October 2019 / Revised: 10 December 2019 / Accepted: 16 December 2019 / Published: 18 December 2019
(This article belongs to the Section Optics and Lasers)
In this paper, a recently-proposed pure-phase optical element, the fractal conical lens (FCL), is introduced for the regulation of strongly-focused circularly-polarized optical vortices in a high numerical aperture (NA) optical system. Strong focusing characteristics of circularly polarized optical vortices through a high NA system in cases with and without a FCL are investigated comparatively. Moreover, the conversion between spin angular momentum (SAM) and orbital angular momentum (OAM) of the focused optical vortex in the focal vicinity is also analyzed. Results revealed that a FCL of different stage S could significantly regulate the distributions of tight focusing intensity and angular momentum of the circularly polarized optical vortex. The interesting results obtained here may be advantageous when using a FCL to shape vortex beams or utilizing circularly polarized vortex beams to exploit new-type optical tweezers. View Full-Text
Keywords: laser beam shaping; polarization; image formation theory laser beam shaping; polarization; image formation theory
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Liu, Z.; Huang, K.; Yang, A.; Wang, X.; Jones, P.H. Strongly Focused Circularly Polarized Optical Vortices Regulated by a Fractal Conical Lens. Appl. Sci. 2020, 10, 28.

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