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: | Kadodwala, Professor Malcolm and Kelly, Mr Christopher and Karimullah, Dr Affar and Barron, Professor Laurence and Gadegaard, Professor Nikolaj |
| 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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