Induced chirality through electromagnetic coupling between chiral molecular layers and plasmonic nanostructures

Abdulrahman, N.A., Fan, Z., Tonooka, T., Kelly, S.M. , Gadegaard, N. , Hendry, E., Govorov, A.O. and Kadodwala, M. (2012) Induced chirality through electromagnetic coupling between chiral molecular layers and plasmonic nanostructures. Nano Letters, 12(2), pp. 977-983. (doi:10.1021/nl204055r)

Abdulrahman, N.A., Fan, Z., Tonooka, T., Kelly, S.M. , Gadegaard, N. , Hendry, E., Govorov, A.O. and Kadodwala, M. (2012) Induced chirality through electromagnetic coupling between chiral molecular layers and plasmonic nanostructures. Nano Letters, 12(2), pp. 977-983. (doi:10.1021/nl204055r)

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Abstract

We report a new approach for creating chiral plasmonic nanomaterials. A previously unconsidered, far-field mechanism is utilized which enables chirality to be conveyed from a surrounding chiral molecular material to a plasmonic resonance of an achiral metallic nanostructure. Our observations break a currently held preconception that optical properties of plasmonic particles can most effectively be manipulated by molecular materials through near-field effects. We show that far-field electromagnetic coupling between a localized plasmon of a nonchiral nanostructure and a surrounding chiral molecular layer can induce plasmonic chirality much more effectively (by a factor of 103) than previously reported near-field phenomena. We gain insight into the mechanism by comparing our experimental results to a simple electromagnetic model which incorporates a plasmonic object coupled with a chiral molecular medium. Our work offers a new direction for the creation of hybrid molecular plasmonic nanomaterials that display significant chiroptical properties in the visible spectral regionWe report a new approach for creating chiral plasmonic nanomaterials. A previously unconsidered, far-field mechanism is utilized which enables chirality to be conveyed from a surrounding chiral molecular material to a plasmonic resonance of an achiral metallic nanostructure. Our observations break a currently held preconception that optical properties of plasmonic particles can most effectively be manipulated by molecular materials through near-field effects. We show that far-field electromagnetic coupling between a localized plasmon of a nonchiral nanostructure and a surrounding chiral molecular layer can induce plasmonic chirality much more effectively (by a factor of 103) than previously reported near-field phenomena. We gain insight into the mechanism by comparing our experimental results to a simple electromagnetic model which incorporates a plasmonic object coupled with a chiral molecular medium. Our work offers a new direction for the creation of hybrid molecular plasmonic nanomaterials that display significant chiroptical properties in the visible spectral region.

Item Type:Articles (Letter)
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Kelly, Dr Sharon and Gadegaard, Professor Nikolaj and Abdulrahman, Mrs Nadia and Kadodwala, Professor Malcolm
Authors: Abdulrahman, N.A., Fan, Z., Tonooka, T., Kelly, S.M., Gadegaard, N., Hendry, E., Govorov, A.O., and Kadodwala, M.
College/School:College of Science and Engineering > School of Chemistry
College of Medical Veterinary and Life Sciences > Institute of Molecular Cell and Systems Biology
Journal Name:Nano Letters
ISSN:1530-6984
ISSN (Online):1530-6992
Published Online:20 January 2012

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