Controlling metamaterial transparency with superchiral fields

Kelly, C., Khorashad, L. K., Gadegaard, N. , Barron, L. D., Govorov, A. O., Karimullah, A. S. and Kadodwala, M. (2018) Controlling metamaterial transparency with superchiral fields. ACS Photonics, 5(2), pp. 535-543. (doi:10.1021/acsphotonics.7b01071)

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Abstract

The advent of metamaterials has heralded a period of unprecedented control of light. The optical responses of metamaterials are determined by the properties of constituent nanostructures. The current design philosophy for tailoring metamaterial functionality is to use geometry to control the nearfield coupling of the elements of the nanostructures. A drawback of this geometry-focused strategy is that the functionality of a metamaterial is pre-determined and cannot be manipulated easily post-fabrication. Here we present a new design paradigm for metamaterials, in which the coupling between chiral elements of a nanostructure is controlled by the chiral asymmetries of the nearfield, which can be externally manipulated. We call this mechanism dichroic coupling. This phenomenon is used to control the electromagnetic induced transparency displayed by a chiral metamaterial by tuning the chirality of the near fields. This “non-geometric” paradigm for controlling optical properties offers the opportunity to optimally design chiral metamaterials for applications in polarization state control and for ultrasensitive analysis of biomaterials and soft matter.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Kelly, Mr Christopher and Barron, Professor Laurence and Gadegaard, Professor Nikolaj and Kadodwala, Professor Malcolm and Karimullah, Dr Affar
Authors: Kelly, C., Khorashad, L. K., Gadegaard, N., Barron, L. D., Govorov, A. O., 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:ACS Photonics
Publisher:American Chemical Society
ISSN:2330-4022
ISSN (Online):2330-4022
Published Online:10 November 2017
Copyright Holders:Copyright © 2017 American Chemical Society
First Published:First published in ACS Photonics 5(2): 535-543
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
618701Plasmon-Enhanced Chiroptical SensorsMalcolm KadodwalaEngineering and Physical Sciences Research Council (EPSRC)EP/K034936/1CHEM - CHEMISTRY
683531Consortium for advanced materials based on spin chiralityRobert StampsEngineering and Physical Sciences Research Council (EPSRC)EP/M024423/1S&E P&A - PHYSICS & ASTRONOMY