Diabolo Nanoantenna for Enhancing and Confining the Magnetic Optical Field

In this Letter, we introduce a new nanoantenna concept aimed at generating a single magnetic hot spot in the optical frequency range, thus confining and enhancing the magnetic optical field on the background of a much lower electric field. This nanoantenna, designed by applying Babinet’s principle t...

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Bibliographic Details
Published in:Nano letters 2011-03, Vol.11 (3), p.1009-1013
Main Authors: Grosjean, T, Mivelle, M, Baida, F. I, Burr, G. W, Fischer, U. C
Format: Article
Language:English
Subjects:
Applied sciences
Condensed matter: structure, mechanical and thermal properties
Electromagnetism
Electronics
Engineering Sciences
Exact sciences and technology
Low-dimensional structures (superlattices, quantum well structures, multilayers): structure, and nonelectronic properties
Molecular electronics, nanoelectronics
Optics
Photonic
Physics
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Surfaces and interfaces
thin films and whiskers (structure and nonelectronic properties)
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Summary:In this Letter, we introduce a new nanoantenna concept aimed at generating a single magnetic hot spot in the optical frequency range, thus confining and enhancing the magnetic optical field on the background of a much lower electric field. This nanoantenna, designed by applying Babinet’s principle to the bowtie nanoaperture, takes the shape of a diabolo. It differs from the well-known bowtie nanoantenna in that the opposing pair of metal triangles are electrically connected through their facing tips. Thus instead of a large charge density accumulating at the air gap of the bowtie nanoantenna, leading to a large electric field, a high optical current density develops within the central “metal gap” of the diabolo nanoantenna, leading to a large magnetic field. Numerical simulation results on the first nanodiabolo geometries show a 2900-fold enhancement of the magnetic field at a wavelength of 2540 nm, confined to a 40-by-40 nm region near the center of the nanoantenna.
ISSN:1530-6984
1530-6992
DOI:10.1021/nl103817f