Strongly Focused Circularly Polarized Optical Vortices Regulated by a Fractal Conical Lens
Source abstract
Abstract
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.
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Research context
OpenAlex topics: Orbital Angular Momentum in Optics · Microfluidic and Bio-sensing Technologies · Digital Holography and Microscopy
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Department of Applied Physics, East China Jiaotong University, Nanchang 330013, China
Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK
Funding
National Natural Science Foundation of China · Scientific Project of Jiangxi Education Department of China
References (25)
Show source-provided references
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