Controlling the Abrupt Autofocusing of Circular Airy Vortex Beam via Uniaxial Crystal

The propagation of many kinds of structured light beams in uniaxial crystal has been investigated. However, the investigation of the evolution of these structured light beams after the uniaxial crystal is lacking. In this paper, an evolution formula of a light beam after passing through a uniaxial c...

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Bibliographic Details
Published in:Photonics 2022-12, Vol.9 (12), p.943
Main Authors: Liu, Houquan, Zhang, Jiawen, Pu, Huilin, Xu, Jiankang, Xu, Ronghui, Yuan, Libo
Format: Article
Language:English
Subjects:
Angular momentum
circular Airy vortex beam
Circular polarization
Crystal optics
Crystals
Electric fields
Electron beams
Evolution
Focal plane
Investigations
Light
Light beams
Optical components
orbital angular momentum
Polarization
Polarizers
Propagation
uniaxial crystal
Vortices
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Summary:The propagation of many kinds of structured light beams in uniaxial crystal has been investigated. However, the investigation of the evolution of these structured light beams after the uniaxial crystal is lacking. In this paper, an evolution formula of a light beam after passing through a uniaxial crystal is derived. Based on the formula, controlling the autofocusing of a circular Airy vortex beam (CAVB) via a uniaxial crystal is studied. It is found that a uniaxial crystal can prolong the focal length of the autofocusing. By changing the crystal length, the relative weight of the left- and right-hand circular polarization components and the relative value between the orbital and spin angular momentum densities of the beam’s focal plane can be adjusted flexibly. In addition, other optical elements can be inserted between the crystal and the focus to further adjust the focal plane field distribution. The influences of inserting x- and y-polarization polarizers on the intensity distribution are calculated as examples.
ISSN:2304-6732
2304-6732
DOI:10.3390/photonics9120943