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Plasmonic concentrator of magnetic field of light

P. Wrobel ; Tomasz Antosiewicz (Institutionen för teknisk fysik, Kondenserade materiens teori) ; T. Stefaniuk ; T. Szoplik
Journal of Applied Physics (0021-8979). Vol. 112 (2012), 7,
[Artikel, refereegranskad vetenskaplig]

We propose an efficient concentrator of the magnetic component of evanescent field of light for measuring magnetic responses of nanostructures. It is in the form of a tapered fiber probe, which in its final part has corrugations along the angular dimension and is coated with metal except for the aperture at the tip. Internal, azimuthally polarized illumination is concentrated into a subwavelength spot with a strong longitudinal magnetic component H-z. Within the visual range of wavelengths 400-700 nm, the energy density of H-z is up to 50 times larger than that of the azimuthal electric E-phi one. This dominant H-z contribution may be used for magnetic excitation of elementary cells of metamaterials with a single probe guiding a wide spectrum of generated plasmons.

Nyckelord: split-ring resonators, near-field, optical microscope, wave-guides, metamaterials, tip, permittivity, permeability, propagation, frequencies

Denna post skapades 2013-01-03. Senast ändrad 2017-09-14.
CPL Pubid: 169005


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Institutionen för teknisk fysik, Kondenserade materiens teori (1900-2015)



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