Magnetic hyperbolic optical metamaterials
| Autor: | Yuri S. Kivshar, Zi Jing Wong, Ekaterina Pshenay-Severin, Xiang Zhang, Kevin O'Brien, Dragomir N. Neshev, Sergey Kruk |
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| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Permittivity
Science Impedance matching FOS: Physical sciences General Physics and Astronomy 02 engineering and technology 01 natural sciences Electromagnetic radiation Measure (mathematics) General Biochemistry Genetics and Molecular Biology Article Photonic metamaterial 010309 optics Optics Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences Topological order Anisotropy Physics Multidisciplinary Condensed Matter - Mesoscale and Nanoscale Physics Condensed matter physics business.industry Metamaterial General Chemistry 021001 nanoscience & nanotechnology 0210 nano-technology business Physics - Optics Optics (physics.optics) |
| Zdroj: | Kruk, SS; Wong, ZJ; Pshenay-Severin, E; O'Brien, K; Neshev, DN; Kivshar, YS; et al.(2016). Magnetic hyperbolic optical metamaterials. Nature Communications, 7. doi: 10.1038/ncomms11329. UC Berkeley: Retrieved from: http://www.escholarship.org/uc/item/5kr062d7 Nature communications, vol 7, iss 1 Nature Communications Nature Communications, Vol 7, Iss 1, Pp 1-7 (2016) |
| Popis: | Strongly anisotropic media where the principal components of electric permittivity or magnetic permeability tensors have opposite signs are termed as hyperbolic media. Such media support propagating electromagnetic waves with extremely large wave vectors exhibiting unique optical properties. However, in all artificial and natural optical materials studied to date, the hyperbolic dispersion originates solely from the electric response. This restricts material functionality to one polarization of light and inhibits free-space impedance matching. Such restrictions can be overcome in media having components of opposite signs for both electric and magnetic tensors. Here we present the experimental demonstration of the magnetic hyperbolic dispersion in three-dimensional metamaterials. We measure metamaterial isofrequency contours and reveal the topological phase transition between the elliptic and hyperbolic dispersion. In the hyperbolic regime, we demonstrate the strong enhancement of thermal emission, which becomes directional, coherent and polarized. Our findings show the possibilities for realizing efficient impedance-matched hyperbolic media for unpolarized light. The ability to control both electric and magnetic dispersion of light allows a novel type of hyperbolic material with impedance matched to air. Here, the authors show experimentally a topological transition between elliptic and magnetic hyperbolic dispersions in a metamaterial for control of thermal radiation. |
| Databáze: | OpenAIRE |
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