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Plasmonic nano-cavities have the ability to confine light in sub-wavelength gaps. The smallest possible plasmonic nano-cavities are achieved with the nanoparticle on mirror (NPoM) configuration [1], where a flat metal substrate is separated from a nanoparticle with a thin molecular spacer, typically of 1–1.5nm thick (Fig.1a). The massive field enhancement facilitates the strong-coupling of a single...
Longitudinal antenna and transverse cavity modes can be excited when bringing a faceted plasmonic nanoparticle close to a metallic substrate. Their interaction leads to a rich optical response, understandable in terms of the modal symmetry.
The optical response of plasmonic cavities formed by metallic nanoparticles deposited on a metallic substrate separated by self-assembled monolayers of conductive organic molecules can be precisely controlled by the exact chemical composition of the monolayers.
Metallic nanoparticles inside metal cavities show extremely strong plasmonic field enhancement both theoretically and experimentally. Plasmonic coupling gives a universal power-law dependence on particle-surface gap, both for field enhancement and resonant wavelength shift.
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