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Optical characterization of charge transfer and bonding dimer plasmons in linked interparticle gaps

AutorPérez-González, O. ; Zabala, Nerea ; Aizpurua, Javier
Fecha de publicación2011
EditorInstitute of Physics Publishing
CitaciónNew Journal of Physics 13: 083013 (2011)
ResumenWe present a theoretical study of the optical properties of nanoparticle dimers connected by conductive gap linkers. The geometrical and conductive properties of the linker modify strongly the optical response of the linked metallic cavity. Two plasmonic modes are responsible for the main spectral features of the cavity: a bonding dimer plasmon (BDP) and a charge transfer plasmon (CTP). We first explore how these two modes are modified as a function of the geometry and the conductance through the cavity, identifying the spatial distribution of the linking current densities. Furthermore, we introduce a resonant feature in the conductivity of the linker, where we observe a complex splitting of the plasmon modes. We also study the capabilities of the BDP and CTP modes in localized surface plasmon resonance (LSPR) sensing. © IOP Publishing Ltd and Deutsche Physikalische Gesellschaft.
URIhttp://hdl.handle.net/10261/50759
DOI10.1088/1367-2630/13/8/083013
Identificadoresdoi: 10.1088/1367-2630/13/8/083013
issn: 1367-2630
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