Coherent and incoherent metamaterials
Coherent and incoherent metamaterials
We introduce a new class of coherent metamaterials where regular ensembles of meta-molecules show collective, coherent narrow-band response leading to unusual electromagnetic properties.
Artificial electromagnetic metamaterials provide a uniquely fertile ground for achieving all kinds of unusual functionalities: they show negative index of refraction required for the creation of diffraction-free superlenses, exhibit strong optical magnetism and impose asymmetric transmission of light. Metamaterial structures can be invisible, act as electromagnetic cloaks, show exceptionally high or zero refractive indices and even behave like optical frequency "superconductors" repelling the magnetic field of the optical wave thus mimicking the Meissner effect.
Here we study a new class of coherent meta-materials where an ordered ensemble of meta-molecules exhibits collective, coherent narrow-band response, while introducing positional disorder leads to broadening and eventually disappearance of the resonance. We draw parallels between the observed collective behaviour of meta-molecules and the Mössbauer effect and notice some remarkable similarity with a ferromagnetic phase transition in a two-dimensional Ising spin lattice.
Finally, another intriguing and unique property of "coherent" metamaterials will be the dependence of their absorption and reflection spectra on the size of the sampled array. We demonstrate that the narrow-band resonance is featured in the spectrum only when a large number of meta-molecules is involved in the formation of the electromagnetic response. In a similar way, optical spectra measured with spatially coherent and incoherent sources of electromagnetic radiation will be different and sharp resonances will be observed only under coherent illumination.
Papasimakis, N.
f416bfa9-544c-4a3e-8a2d-bc1c11133a51
Fedotov, V.A.
3725f5cc-2d0b-4e61-95c5-26d187c84f25
Zheludev, N.I.
32fb6af7-97e4-4d11-bca6-805745e40cc6
January 2009
Papasimakis, N.
f416bfa9-544c-4a3e-8a2d-bc1c11133a51
Fedotov, V.A.
3725f5cc-2d0b-4e61-95c5-26d187c84f25
Zheludev, N.I.
32fb6af7-97e4-4d11-bca6-805745e40cc6
Papasimakis, N., Fedotov, V.A. and Zheludev, N.I.
(2009)
Coherent and incoherent metamaterials.
2nd European Topical Meeting on Nanophotonics and Metamaterials (NanoMeta 2009), Seefeld, Austria.
05 - 08 Jan 2009.
Record type:
Conference or Workshop Item
(Paper)
Abstract
We introduce a new class of coherent metamaterials where regular ensembles of meta-molecules show collective, coherent narrow-band response leading to unusual electromagnetic properties.
Artificial electromagnetic metamaterials provide a uniquely fertile ground for achieving all kinds of unusual functionalities: they show negative index of refraction required for the creation of diffraction-free superlenses, exhibit strong optical magnetism and impose asymmetric transmission of light. Metamaterial structures can be invisible, act as electromagnetic cloaks, show exceptionally high or zero refractive indices and even behave like optical frequency "superconductors" repelling the magnetic field of the optical wave thus mimicking the Meissner effect.
Here we study a new class of coherent meta-materials where an ordered ensemble of meta-molecules exhibits collective, coherent narrow-band response, while introducing positional disorder leads to broadening and eventually disappearance of the resonance. We draw parallels between the observed collective behaviour of meta-molecules and the Mössbauer effect and notice some remarkable similarity with a ferromagnetic phase transition in a two-dimensional Ising spin lattice.
Finally, another intriguing and unique property of "coherent" metamaterials will be the dependence of their absorption and reflection spectra on the size of the sampled array. We demonstrate that the narrow-band resonance is featured in the spectrum only when a large number of meta-molecules is involved in the formation of the electromagnetic response. In a similar way, optical spectra measured with spatially coherent and incoherent sources of electromagnetic radiation will be different and sharp resonances will be observed only under coherent illumination.
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Published date: January 2009
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Invited paper
Venue - Dates:
2nd European Topical Meeting on Nanophotonics and Metamaterials (NanoMeta 2009), Seefeld, Austria, 2009-01-05 - 2009-01-08
Identifiers
Local EPrints ID: 65799
URI: http://eprints.soton.ac.uk/id/eprint/65799
PURE UUID: 1df0af39-73c1-4dc2-b353-1fe465242737
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Date deposited: 30 Mar 2009
Last modified: 11 Dec 2021 04:15
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Contributors
Author:
N. Papasimakis
Author:
V.A. Fedotov
Author:
N.I. Zheludev
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