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- W25705840 abstract "We introduce a new class of metamaterials where regular ensembles of meta-molecules show collective, 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 meta-materials where an ordered ensemble of meta-molecules exhibits collective, 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 Mossbauer 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 and incoherent sources of electromagnetic radiation will be different and sharp resonances will be observed only under illumination." @default.
- W25705840 created "2016-06-24" @default.
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- W25705840 date "2009-01-01" @default.
- W25705840 modified "2023-09-27" @default.
- W25705840 title "Coherent and incoherent metamaterials" @default.
- W25705840 hasPublicationYear "2009" @default.
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