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ToolsForbes, Kayn A. (2024) Spin angular momentum and optical chirality of Poincaré vector vortex beams. Journal of Optics, 26 (12). ISSN 2040-8978
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Abstract
The optical chirality and spin angular momentum of structured scalar vortex beams has been intensively studied in recent years. The pseudoscalar topological charge ℓ of these beams is responsible for their unique properties. Constructed from a superposition of scalar vortex beams with topological charges ℓ A and ℓ B , cylindrical vector vortex beams are higher-order Poincaré modes which possess a spatially inhomogeneous polarization distribution. Here we highlight the highly tailorable and exotic spatial distributions of the optical spin and chirality densities of these higher-order structured beams under both paraxial (weak focusing) and non-paraxial (tight focusing) conditions. Our analytical theory can yield the spin angular momentum and optical chirality of each point on any higher-order or hybrid-order Poincaré sphere. It is shown that the tunable Pancharatnam topological charge ℓ P = ( ℓ A + ℓ B ) / 2 and polarization index m = ( ℓ B − ℓ A ) / 2 of the vector vortex beam plays a decisive role in customizing their spin and chirality spatial distributions. We also provide the correct analytical equations to describe a focused, non-paraxial scalar Bessel beam.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | nano optics,nonparaxial,optical angular momentum,optical chirality,optical vortex,structured light,vector beams,electronic, optical and magnetic materials,atomic and molecular physics, and optics ,/dk/atira/pure/subjectarea/asjc/2500/2504 |
| Faculty \ School: | Faculty of Science > School of Chemistry, Pharmacy and Pharmacology |
| Related URLs: | |
| Depositing User: | LivePure Connector |
| Date Deposited: | 11 Nov 2024 17:30 |
| Last Modified: | 28 Jan 2025 23:41 |
| URI: | https://ueaeprints.uea.ac.uk/id/eprint/97620 |
| DOI: |
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