Journal
ACS NANO
Volume 5, Issue 4, Pages 3293-3308Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn200438e
Keywords
plasmonics; nanoparticles; transformation optics; field enhancement; hybridization; metal surface; invisibility dips
Categories
Funding
- European Community [213390]
- UK Engineering and Physical Sciences Research Council (EPSRC)
- Engineering and Physical Sciences Research Council [EP/D063329/1, EP/H000917/2, EP/H000917/1] Funding Source: researchfish
- EPSRC [EP/D063329/1, EP/H000917/2, EP/H000917/1] Funding Source: UKRI
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The interaction between metallic nanowires and a metal substrate is investigated by means of transformation optics. This plasmonic system Is of particular interest for single molecule detection or nanolasers. By mapping such a plasmonic device onto a metal-insulator-metal infinite structure, its optical response can be fully derived analytically. In this article, the absorption cross-section of a nanowire placed close to a metallic surface is derived within and beyond the quasi-static limit. The system is shown to support several modes characterized by a different angular momentum and whose resonance red-shifts when the nanoparticle approaches the metal substrate. These resonances give rise to a drastic field enhancement (>10(2)) within the narrow gap separating the nanoparticle from the metal surface. The case of a nanowire dimer is also investigated and is closely related to the previous configuration. More physical insights are provided especially with respect to the Invisibility dips appearing In the radiative spectrum. Numerical simulations have also been performed to confirm our analytical predictions and determine their range of validity.
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