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Strong interactions and subradiance in disordered metamaterials

Strong interactions and subradiance in disordered metamaterials
Strong interactions and subradiance in disordered metamaterials

We provide detailed comparisons between experimental findings and numerical simulations of large cooperatively interacting, spatially disordered metamaterial arrays, consisting of asymmetrically split rings. Simulation methods fully incorporate strong field-mediated inter-meta-atom interactions between discrete resonators and statistical properties of disorder, while approximating the resonators' internal structure. Despite the large system size, we find a qualitative agreement between the simulations and experiments and characterize the microscopic origins of the observed disorder response. Our microscopic description of macroscopic electrodynamics reveals how the response of disordered arrays with strong field-mediated interactions is inherently linked to their cooperative response to electromagnetic waves where the multiple scattering induces strong correlations between the excitations of individual resonators. Whereas for a regular array the response can be overwhelmingly dominated by a spatially extended collective eigenmode with subradiant characteristics, a gradual increase of the positional disorder rapidly leads to a spatial localization of both the electric and magnetic dipolar excitation profile of this eigenmode. We show how the effects of disorder and cooperative interactions are mapped onto the transmission resonance in the far field spectrum and measure the "cooperative Lamb shift" of the resonance that is shifting toward the red as the disorder increases. The interplay between the disorder and interactions generally is most dramatic in the microwave arrays, but we find that in suitable regimes the strong disorder effects can be achieved also for plasmonic optical systems.

2469-9950
Jenkins, Stewart D.
65d861fb-b85a-4927-805a-7c906fca26c6
Papasimakis, Nikitas
f416bfa9-544c-4a3e-8a2d-bc1c11133a51
Savo, Salvatore
13a30585-d93e-4616-908c-44136934e6f0
Zheludev, Nikolay I.
32fb6af7-97e4-4d11-bca6-805745e40cc6
Ruostekoski, Janne
2beb155e-64b0-4ee9-9cfe-079947a9c9f4
Jenkins, Stewart D.
65d861fb-b85a-4927-805a-7c906fca26c6
Papasimakis, Nikitas
f416bfa9-544c-4a3e-8a2d-bc1c11133a51
Savo, Salvatore
13a30585-d93e-4616-908c-44136934e6f0
Zheludev, Nikolay I.
32fb6af7-97e4-4d11-bca6-805745e40cc6
Ruostekoski, Janne
2beb155e-64b0-4ee9-9cfe-079947a9c9f4

Jenkins, Stewart D., Papasimakis, Nikitas, Savo, Salvatore, Zheludev, Nikolay I. and Ruostekoski, Janne (2018) Strong interactions and subradiance in disordered metamaterials. Physical Review B, 98 (24). (doi:10.1103/PhysRevB.98.245136).

Record type: Article

Abstract

We provide detailed comparisons between experimental findings and numerical simulations of large cooperatively interacting, spatially disordered metamaterial arrays, consisting of asymmetrically split rings. Simulation methods fully incorporate strong field-mediated inter-meta-atom interactions between discrete resonators and statistical properties of disorder, while approximating the resonators' internal structure. Despite the large system size, we find a qualitative agreement between the simulations and experiments and characterize the microscopic origins of the observed disorder response. Our microscopic description of macroscopic electrodynamics reveals how the response of disordered arrays with strong field-mediated interactions is inherently linked to their cooperative response to electromagnetic waves where the multiple scattering induces strong correlations between the excitations of individual resonators. Whereas for a regular array the response can be overwhelmingly dominated by a spatially extended collective eigenmode with subradiant characteristics, a gradual increase of the positional disorder rapidly leads to a spatial localization of both the electric and magnetic dipolar excitation profile of this eigenmode. We show how the effects of disorder and cooperative interactions are mapped onto the transmission resonance in the far field spectrum and measure the "cooperative Lamb shift" of the resonance that is shifting toward the red as the disorder increases. The interplay between the disorder and interactions generally is most dramatic in the microwave arrays, but we find that in suitable regimes the strong disorder effects can be achieved also for plasmonic optical systems.

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More information

e-pub ahead of print date: 21 December 2018

Identifiers

Local EPrints ID: 429239
URI: https://eprints.soton.ac.uk/id/eprint/429239
ISSN: 2469-9950
PURE UUID: 96acc85b-a13f-4e89-9c0c-a538767e3f3a
ORCID for Nikitas Papasimakis: ORCID iD orcid.org/0000-0002-6347-6466
ORCID for Nikolay I. Zheludev: ORCID iD orcid.org/0000-0002-1013-6636

Catalogue record

Date deposited: 22 Mar 2019 17:30
Last modified: 23 Mar 2019 01:37

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