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Cooperative field localization and excitation eigenmodes in disordered metamaterials

Cooperative field localization and excitation eigenmodes in disordered metamaterials
Cooperative field localization and excitation eigenmodes in disordered metamaterials
We investigate numerically and experimentally the near-field response of disordered arrays comprising asymmetrically split ring resonators that exhibit strong cooperative response. Our simulations treat the unit cell split ring resonators as discrete pointlike oscillators with associated electric and magnetic point dipole radiation, while the strong cooperative radiative coupling between the different split rings is fully included at all orders. The methods allow to calculate local field and Purcell factor enhancement arising from the collective electric and magnetic excitations. We find substantially increased standard deviation of the Purcell-enhancement with disorder, making it increasingly likely to find collective excitation eigenmodes with very high Purcell factors that are also stronger for magnetic than electric excitations. We show that disorder can dramatically modify the cooperative response of the metamaterial even in the presence of strong dissipation losses as is the case for plasmonic systems. Our analysis in terms of collective eigenmodes paves a way for controlled engineering of electromagnetic device functionalities based on strongly interacting metamaterial arrays.
Metamaterials, Disorder, localisation
1550-235X
Papasimakis, Nikitas
f416bfa9-544c-4a3e-8a2d-bc1c11133a51
Jenkins, Stewart D
65d861fb-b85a-4927-805a-7c906fca26c6
Savo, Salvatore
13a30585-d93e-4616-908c-44136934e6f0
Zheludev, Nikolai
32fb6af7-97e4-4d11-bca6-805745e40cc6
Ruostekoski, Janne
2beb155e-64b0-4ee9-9cfe-079947a9c9f4
Papasimakis, Nikitas
f416bfa9-544c-4a3e-8a2d-bc1c11133a51
Jenkins, Stewart D
65d861fb-b85a-4927-805a-7c906fca26c6
Savo, Salvatore
13a30585-d93e-4616-908c-44136934e6f0
Zheludev, Nikolai
32fb6af7-97e4-4d11-bca6-805745e40cc6
Ruostekoski, Janne
2beb155e-64b0-4ee9-9cfe-079947a9c9f4

Papasimakis, Nikitas, Jenkins, Stewart D, Savo, Salvatore, Zheludev, Nikolai and Ruostekoski, Janne (2019) Cooperative field localization and excitation eigenmodes in disordered metamaterials. Physical Review B, 99, [014210]. (doi:10.1103/PhysRevB.99.014210).

Record type: Article

Abstract

We investigate numerically and experimentally the near-field response of disordered arrays comprising asymmetrically split ring resonators that exhibit strong cooperative response. Our simulations treat the unit cell split ring resonators as discrete pointlike oscillators with associated electric and magnetic point dipole radiation, while the strong cooperative radiative coupling between the different split rings is fully included at all orders. The methods allow to calculate local field and Purcell factor enhancement arising from the collective electric and magnetic excitations. We find substantially increased standard deviation of the Purcell-enhancement with disorder, making it increasingly likely to find collective excitation eigenmodes with very high Purcell factors that are also stronger for magnetic than electric excitations. We show that disorder can dramatically modify the cooperative response of the metamaterial even in the presence of strong dissipation losses as is the case for plasmonic systems. Our analysis in terms of collective eigenmodes paves a way for controlled engineering of electromagnetic device functionalities based on strongly interacting metamaterial arrays.

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In preparation date: 2019
Accepted/In Press date: 14 January 2019
e-pub ahead of print date: 24 January 2019
Keywords: Metamaterials, Disorder, localisation

Identifiers

Local EPrints ID: 427627
URI: http://eprints.soton.ac.uk/id/eprint/427627
ISSN: 1550-235X
PURE UUID: 65a112e2-797a-4c9c-9aea-f4d5ff42a5e4
ORCID for Nikitas Papasimakis: ORCID iD orcid.org/0000-0002-6347-6466
ORCID for Nikolai Zheludev: ORCID iD orcid.org/0000-0002-1013-6636

Catalogue record

Date deposited: 24 Jan 2019 17:30
Last modified: 07 Oct 2020 01:53

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Author: Stewart D Jenkins
Author: Salvatore Savo

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