Evaluation of gold nanowire pairs as a potential negative index material

A metamaterial consisting of pairs of metallic nanowires, separated by a dielectric spacer, has been fabricated and spectrally characterized in the visible and near-infrared spectral domain. It is shown, that the structure exhibits both a plasmonic and a magnetic resonance depending on its geometry...

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Bibliographic Details
Published in:Applied physics. B, Lasers and optics Lasers and optics, 2006-07, Vol.84 (1-2), p.139-148
Main Authors: Garwe, F., Rockstuhl, C., Etrich, C., Hübner, U., Bauerschäfer, U., Setzpfandt, F., Augustin, M., Pertsch, T., Tünnermann, A., Lederer, F.
Format: Article
Language:English
Subjects:
Magnetic resonance
Metamaterials
Nanocomposites
Nanomaterials
Nanowires
Plasmonics
Spacers
Spectra
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Summary:A metamaterial consisting of pairs of metallic nanowires, separated by a dielectric spacer, has been fabricated and spectrally characterized in the visible and near-infrared spectral domain. It is shown, that the structure exhibits both a plasmonic and a magnetic resonance depending on its geometry and orientation with respect to the illuminating wave field. In particular, we investigate the influence of the thickness of the spacer layer on the spectral position of the resonances and show that, for an appropriate adjustment, both resonances coincide. Measurements of the amplitude and the phase of the transmitted wave are presented. It is also shown that the material is highly anisotropic with respect to the angle of incidence, as the plasmonic resonance wavelength depends strongly on it whereas the magnetic resonance does not show this sensitivity. All experimental results are supported by numerical simulations.
ISSN:0946-2171
1432-0649
DOI:10.1007/s00340-006-2255-5