Article
Metallo-dielectric core-shell nanospheres as building blocks for optical three-dimensional isotropic negative-index metamaterials
Author/s | Paniagua Domínguez, Ramón
López-Tejeira Sagüés, Fernando Marqués Sillero, Ricardo Sánchez Gil, José Antonio |
Department | Universidad de Sevilla. Departamento de Electrónica y Electromagnetismo |
Publication Date | 2011 |
Deposit Date | 2017-11-28 |
Published in |
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Abstract | Materials showing electromagnetic properties that are not attainable in naturally occurring media, so-called metamaterials, have been lately, and still are, among the most active topics in optical and materials physics and ... Materials showing electromagnetic properties that are not attainable in naturally occurring media, so-called metamaterials, have been lately, and still are, among the most active topics in optical and materials physics and engineering. Among these properties, one of the most attractive ones is the subdiffraction resolving capability predicted for media having an index of refraction of -1. Here, we propose a fully three-dimensional, isotropic metamaterial with strong electric and magnetic responses in the optical regime, based on spherical metallo-dielectric core-shell nanospheres. The magnetic response stems from the lowest, magnetic-dipole resonance of the dielectric shell with a high refractive index, and can be tuned to coincide with the plasmon resonance of the metal core, responsible for the electric response. Since the response does not originate from coupling between structures, no particular periodic arrangement needs to be imposed. Moreover, due to the geometry of the constituents, the metamaterial is intrinsically isotropic and polarization independent. It could be realized with current fabrication techniques with materials such as silver (core) and silicon or germanium (shell). For these particular realistic designs, the metamaterials present a negative index in the range of 1.2-1.55 μm. |
Funding agencies | Ministerio de Ciencia e Innovación (MICIN). España Comunidad Autónoma de Madrid |
Project ID. | CSD2008-00066
FIS2009- 11264 MICROSERES P2009/TIC-1476 |
Citation | Paniagua Domínguez, R., López-Tejeira Sagüés, F., Marqués Sillero, R. y Sánchez Gil, J.A. (2011). Metallo-dielectric core-shell nanospheres as building blocks for optical three-dimensional isotropic negative-index metamaterials. New Journal of Physics, 13, 123017. |
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