Coherent and incoherent metamaterials
Papasimakis, N., Fedotov, V.A. and Zheludev, N.I. (2009) Coherent and incoherent metamaterials. In, 2nd European Topical Meeting on Nanophotonics and Metamaterials (NanoMeta 2009), Seefeld, Austria, 05 - 08 Jan 2009.
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Description/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 disappereance 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.
| Item Type: | Conference or Workshop Item (Paper) |
|---|---|
| Additional Information: | Invited paper |
| Related URLs: | |
| Subjects: | T Technology > TK Electrical engineering. Electronics Nuclear engineering Q Science > QC Physics |
| Divisions: | University Structure - Pre August 2011 > Optoelectronics Research Centre |
| Item ID: | 65799 |
| Date Deposited: | 30 Mar 2009 |
| Last Modified: | 01 Jun 2011 07:29 |
| Contributors: | Papasimakis, N. (Author) Fedotov, V.A. (Author) Zheludev, N.I. (Author) |
| Date: | January 2009 |
| Additional Information: | Invited paper |
| Status: | Published |
| URI: | http://eprints.soton.ac.uk/id/eprint/65799 |
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