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Forbes, Kayn A. 
ORCID: https://orcid.org/0000-0002-8884-3496 and Andrews, David L.
(2021)
Orbital angular momentum of twisted light: Chirality and optical activity.
Journal of Physics-Photonics, 3 (2).
ISSN 2515-7647
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Abstract
Optical activity is conventionally understood as a natural difference in the optical responses of chiral materials with opposite handedness. It stems from the quantised spin angular momentum ±h per photon, with the ± representing either left- or right-handed circular polarisations. Less well known, until recently, was the possibility that matter might also respond in a similar, discriminatory way to the handedness of twisted light, or 'optical vortices', whose orbital angular momentum (OAM) is quantised as ℓh per photon, where ℓ is the topological charge whose sign determines a wavefront twist to the left or right. Initial studies focusing on whether, in spectroscopic applications, chiral matter might respond differently to the vortex handedness of +ℓ and -ℓ beams, failed to identify any viable mechanism. However, in the last few years, theory and experiment have both supplied ample evidence that, under certain conditions, such forms of interaction do exist-and as a result, the field of chirality and optical OAM is beginning to flourish at a pace. This topical review presents a survey of this new field, working up from a description of those initial studies to the cutting-edge experiments now taking place. Analysing the fundamental mechanisms provides for a revision of previous precepts, broadening their scope in the light of recent advances in understanding, and highlighting a vibrant synergy between the fields of optical activity and twisted light.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | chirality,chiroptical spectroscopy,optical helicity,plasmonics,spin-orbit interactions,structured light,atomic and molecular physics, and optics,electronic, optical and magnetic materials,electrical and electronic engineering ,/dk/atira/pure/subjectarea/asjc/3100/3107 |
| Faculty \ School: | Faculty of Science > School of Chemistry |
| UEA Research Groups: | Faculty of Science > Research Groups > Chemistry of Light and Energy Faculty of Science > Research Groups > Centre for Photonics and Quantum Science |
| Related URLs: | |
| Depositing User: | LivePure Connector |
| Date Deposited: | 03 Jun 2021 14:25 |
| Last Modified: | 29 Mar 2024 15:30 |
| URI: | https://ueaeprints.uea.ac.uk/id/eprint/80202 |
| DOI: | 10.1088/2515-7647/abdb06 |
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