Cooperative field localization and excitation eigenmodes in disordered metamaterials

Papasimakis, Nikitas and Jenkins, Stewart D. and Savo, Salvatore and Zheludev, Nikolay I. and Ruostekoski, Janne (2019) Cooperative field localization and excitation eigenmodes in disordered metamaterials. Physical Review B: Condensed Matter and Materials Physics, 99 (1). 014210-1-12. ISSN 2469-9950

[img]
Preview
PDF (disorder_paper_prb_B_accepted)
disorder_paper_prb_B_accepted.pdf - Accepted Version
Available under License Creative Commons Attribution-NonCommercial.

Download (11MB)
[img]
Preview
PDF (PhysRevB.99.014210)
PhysRevB.99.014210.pdf - Published Version
Available under License Unspecified.

Download (3MB)

Abstract

We investigate numerically and experimentally the near-field response of disordered arrays comprising asymmetrically split ring resonators that exhibit a 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 us 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 the way for controlled engineering of electromagnetic device functionalities based on strongly interacting metamaterial arrays.

Item Type:
Journal Article
Journal or Publication Title:
Physical Review B: Condensed Matter and Materials Physics
Additional Information:
©2019 American Physical Society. All rights reserved.
ID Code:
130778
Deposited By:
Deposited On:
30 Jan 2019 10:45
Refereed?:
Yes
Published?:
Published
Last Modified:
19 Sep 2020 05:41