Superchiral hot-spots in “real” chiral plasmonic structures

Gilroy, C., Koyroytsaltis-McQuire, D. J. P., Gadegaard, N. , Karimullah, A. S. and Kadodwala, M. (2022) Superchiral hot-spots in “real” chiral plasmonic structures. Materials Advances, 3(1), pp. 346-354. (doi: 10.1039/D1MA00831E)

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Abstract

Light scattering from chiral plasmonic structures can create near fields with an asymmetry greater than the equivalent circularly polarised light, a property sometimes referred to as superchirality. These near fields with enhanced chiral asymmetries can be exploited for ultrasensitive detection of chiral (bio)molecules. In this combined experimental and numerical modelling study, we demonstrate that superchiral hot-spots are created around structural heterogeneities, such as protrusions and indentations, possessed by all real metal structures. These superchiral hot-spots, have chiral asymmetries greater than what would be expected from an idealised perfect structure. Our work indicates that surface morphology could play a role in determining the efficacy of a chiral structure for sensing.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Koyroytsaltis-McQuire, Dominic and Kadodwala, Professor Malcolm and Karimullah, Dr Affar and Gilroy, Mr Cameron and Gadegaard, Professor Nikolaj
Authors: Gilroy, C., Koyroytsaltis-McQuire, D. J. P., Gadegaard, N., Karimullah, A. S., and Kadodwala, M.
College/School:College of Science and Engineering > School of Chemistry
College of Science and Engineering > School of Engineering > Biomedical Engineering
Journal Name:Materials Advances
Publisher:Royal Society of Chemistry
ISSN:2633-5409
ISSN (Online):2633-5409
Published Online:02 November 2021
Copyright Holders:Copyright © 2021 The Authors
First Published:First published in Materials Advances 3(1): 346-354
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
173324Mapping the mesoscale structural landscape using "sculpted" chiral plasmonic fieldsMalcolm KadodwalaEngineering and Physical Sciences Research Council (EPSRC)EP/P00086X/1Chemistry
190883Consortium for advanced materials based on spin chiralityStephen McVitieEngineering and Physical Sciences Research Council (EPSRC)EP/M024423/1P&S - Physics & Astronomy
190828EPSRC Centre for Doctoral Training in Sensing and MeasurementAndrew HarveyEngineering and Physical Sciences Research Council (EPSRC)EP/L016753/1P&S - Physics & Astronomy
305796A nano-resonator route to colossal magnetochiral optical effectsMalcolm KadodwalaLeverhulme Trust (LEVERHUL)RF-2019-023\4Chemistry