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The angular momentum of twisted light in anisotropic media: chiroptical interactions in chiral and achiral materials
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Paper Abstract

The issue of whether the optical orbital angular momentum of light can play any significant role in chiroptical interactions has seen a resurgence of interest in the past few years. Revising preliminary expectations, it has been shown both theoretically and experimentally that the topological charge can indeed play a decisive role in some chiroptical interactions, with the rates of these optical phenomena proving sensitive to the sign of the vortex charge ℓ. Using quantum electrodynamics, it is now revealed how the inclusion of molecular electric-quadrupole transition moments in both chiral and achiral anisotropic media produces such an effect. Specifically, for single-photon absorption it transpires that both the orbital and spin angular momentum must be engaged through a circularly polarized vortex beam. The chiroptical effect is identified as a manifestation spin-orbit interaction in light.

Paper Details

Date Published: 4 May 2018
PDF: 10 pages
Proc. SPIE 10672, Nanophotonics VII, 1067210 (4 May 2018); doi: 10.1117/12.2305723
Show Author Affiliations
Kayn A. Forbes, Univ. of East Anglia (United Kingdom)
David L. Andrews, Univ. of East Anglia (United Kingdom)

Published in SPIE Proceedings Vol. 10672:
Nanophotonics VII
David L. Andrews; Angus J. Bain; Jean-Michel Nunzi; Andreas Ostendorf, Editor(s)

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