Optical vortex generation from molecular chromophore arrays

Williams, Mathew D., Coles, Matthew, Saadi, Kamel, Bradshaw, David S. and Andrews, David L. (2013) Optical vortex generation from molecular chromophore arrays. Physical Review Letters, 111 (15). ISSN 0031-9007

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Abstract

The generation of light endowed with orbital angular momentum, frequently termed optical vortex light, is commonly achieved by passing a conventional beam through suitably constructed optical elements. This Letter shows that the necessary phase structure for vortex propagation can be directly produced through the creation of twisted light from the vacuum. The mechanism is based on optical emission from a family of chromophore nanoarrays that satisfy specific geometric and symmetry constraints. Each such array can support pairs of electronically delocalized doubly degenerate excitons whose azimuthal phase progression is responsible for the helical wave front of the emitted radiation. The exciton symmetry dictates the maximum magnitude of topological charge; detailed analysis secures the conditions necessary to deliver optical vortices of arbitrary order.

Item Type: Article
Additional Information: This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. © 2013 American Physical Society
Faculty \ School: Faculty of Science
Faculty of Science > School of Chemistry
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Depositing User: Pure Connector
Date Deposited: 09 Jul 2014 10:50
Last Modified: 17 Sep 2020 23:56
URI: https://ueaeprints.uea.ac.uk/id/eprint/49280
DOI: 10.1103/PhysRevLett.111.153603

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