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. (a) Schematic diagram of a nanoparticle-on-mirror (NPoM) nanocavity with diameter 2R = 80 nm, facet diameter 2f and gap size d = 5 nm. (b) The field enhancement distribution of the bonding dipole plasmon (BDP) of the NPoM with f = 10 nm (c) Scattering cross-section σscat for the NPoM with f = 0, 5 and 10 nm and for nanoparticles (NPs) on plain dielectric substrates with f = 0 and 10 nm.
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