Chiral metafilms and surface enhanced Raman scattering for enantiomeric discrimination of helicoid nanoparticles

Kartau, M. et al. (2023) Chiral metafilms and surface enhanced Raman scattering for enantiomeric discrimination of helicoid nanoparticles. Advanced Optical Materials, 11(9), 2202991. (doi: 10.1002/adom.202202991)

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Chiral nanophotonic platforms provide a means of creating near fields with both enhanced asymmetric properties and intensities. They can be exploited for optical measurements that allow enantiomeric discrimination at detection levels > 6 orders of magnitude than is achieved with conventional chirally sensitive spectroscopic methods based on circularly polarized light. Here it is shown that surface enhanced Raman spectroscopy (SERS) is such a local probe of the near field environment. It is used to achieve enantiomeric discrimination of chiral helicoid nanoparticles deposited on left- and right-handed enantiomorphs of a chiral metafilm using an achiral molecule as a probe. “Hotter” electromagnetic (EM) hotspots are created for matched combinations of helicoid and metafilms (left-left and right-right), while mismatched combinations leads to significantly “cooler” electromagnetic hotspots. This large enantiomeric dependency on hotspot intensity is readily detected using SERS with the aid of an achiral Raman reporter molecule. In effect SERS is used to distinguish between the different EM environments of the plasmonic diastereomers produced by mixing chiral nanoparticles and metafilms. The work demonstrates that by combining chiral nanophotonic platforms with established SERS strategies new avenues in ultrasensitive chiral detection can be opened.

Item Type:Articles
Glasgow Author(s) Enlighten ID:TABOUILLOT, Victor and Skvortsova, Anastasia and Kumar, Dr Rahul and Gadegaard, Professor Nikolaj and Karimullah, Dr Affar and Chaubey, Mr Shailendra Kuma and Kartau, Mr Martin and Kadodwala, Professor Malcolm
Authors: Kartau, M., Skvortsova, A., Tabouillot, V., Chaubey, S. K., Bainova, P., Kumar, R., Burstev, V., Svorcik, V., Gadegaard, N., Im, S. W., Urbanova, M., Lyutakov, O., Kadodwala, M., and Karimullah, A. S.
College/School:College of Science and Engineering > School of Chemistry
College of Science and Engineering > School of Engineering > Biomedical Engineering
Journal Name:Advanced Optical Materials
ISSN (Online):2195-1071
Published Online:14 March 2023
Copyright Holders:Copyright © 2023 The Authors
First Published:First published in Advanced Optical Materials 11(9): 2202991
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
302406High-Throughput Diagnostics with Chiral Plasmonic AssaysAffar KarimullahEngineering and Physical Sciences Research Council (EPSRC)EP/S001514/1Chemistry
304762Meta-Smart: Dynamic hybrid bio-plasmonic metamaterials.Malcolm KadodwalaEngineering and Physical Sciences Research Council (EPSRC)EP/S029168/1Chemistry
303712'Meta-chemistry': Nanoscale chemical control using spatially localised solvent heatingMalcolm KadodwalaEngineering and Physical Sciences Research Council (EPSRC)EP/S012745/1Chemistry
305796A nano-resonator route to colossal magnetochiral optical effectsMalcolm KadodwalaLeverhulme Trust (LEVERHUL)RF-2019-023\4Chemistry