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Journal Articles Nano Letters Year : 2011

Diabolo Nanoantenna for Enhancing and Confining the Magnetic Optical Field

Abstract

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 nano antenna, 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.
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Dates and versions

hal-00584209 , version 1 (23-04-2021)

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T. Grosjean, Mathieu Mivelle Mivelle, F.I. Baida, G.W. Burr, U.C. Fischer. Diabolo Nanoantenna for Enhancing and Confining the Magnetic Optical Field. Nano Letters, 2011, 11 (3), pp.1009-1013. ⟨10.1021/nl103817f⟩. ⟨hal-00584209⟩
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