Dynamic Modulation of Plasmonic Structures

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A method for active switching of plasmonic structures by surface oxide-stabilized silver deposition is presented. The longitudinal dipole mode in pairs of closely spaced gold nanodisks on ITO was switched by depositing and removing a connecting layer of silver in solution. Optical properties were studied using VIS-NIR extinction spectroscopy and confirmed by FDTD simulations. Uniform dimensional growth by selective silver deposition brought pairs of gold nanodisks of 73 nm average diameter and 11 nm average distance into electrical contact. The growth process was studied by spectroelectrochemical measurements, and uniformity and selectivity were confirmed by SEM and XPS analysis, respectively. Uniform deposition was achieved by introduction of surface oxides on immobilized gold nanodisks, and selectivity by undervoltage deposition. Deposition of silver on disk pairs caused a blue-shift of the transverse dipole mode resonance of roughly 50 nm, and emergence of a new longitudinal mode with resonance around 960 nm. These results demonstrate the possibility for not only tuning of resonance peak position, but also on-demand switching of an additional mode which can provide materials with switchable optical properties.
Original languageEnglish
Article number1
JournalJournal of Self-Assembly and Molecular Electronics
Volume7
Issue1
Pages (from-to)1-22
ISSN2245-4551
DOIs
Publication statusPublished - Feb 2019

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