Magnetic-field enhancement in gold nanosandwiches

Using dispersive finite-difference time-domain (D-FDTD) simulations, we show that a pair of gold nanodisks stacked in a 'sandwich'-like (end-fire) configuration produces a large enhancement of the magnetic field when irradiated with a plane optical wave, if the distance between the nanodis...

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Bibliographic Details
Published inOptics express Vol. 14; no. 18; pp. 8240 - 8246
Main Authors Pakizeh, T, Abrishamian, M S, Granpayeh, N, Dmitriev, A, Käll, M
Format Journal Article
LanguageEnglish
Published United States 04.09.2006
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Summary:Using dispersive finite-difference time-domain (D-FDTD) simulations, we show that a pair of gold nanodisks stacked in a 'sandwich'-like (end-fire) configuration produces a large enhancement of the magnetic field when irradiated with a plane optical wave, if the distance between the nanodisks is optically small. The effect, which can be rationalized in terms of a magnetic dipole resonance, is due the excitation of a hybridized asymmetric plasmon mode, in which the induced electrical dipoles in the two disks oscillate out-of-phase. The strong magnetic response, together with the simple morphology, suggests that Au nanosandwiches are suitable elementary building blocks for optical metamaterials that exhibit negative refraction.
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ISSN:1094-4087
1094-4087
DOI:10.1364/OE.14.008240