Chiral nanoemitter array: A launchpad for optical vortices

Matt M. Coles, Mathew D. Williams, Kamel Saadi, David S. Bradshaw, David L. Andrews (Lead Author)

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)
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Abstract

A chiral arrangement of molecular nanoemitters is shown to support delocalised exciton states whose spontaneous decay can generate optical vortex radiation. In contrast to techniques in which phase modification is imposed upon conventional optical beams, this exciton method enables radiation with a helical wave-front to be produced directly. To achieve this end, a number of important polarisation and symmetry-based criteria need to be satisfied. It emerges that the phase structure of the optical field produced by degenerate excitons in a propeller-shaped array can exhibit precisely the sought character of an optical vortex – one with unit topological charge. Practical considerations for the further development of this technique are discussed, and potential new applications are identified.
Original languageEnglish
Pages (from-to)1088-1092
Number of pages5
JournalLaser & Photonics Reviews
Volume7
Issue number6
Early online date11 Oct 2013
DOIs
Publication statusPublished - Nov 2013

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