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Tracking Optical Welding through Groove Modes in Plasmonic Nanocavities

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Title: Tracking Optical Welding through Groove Modes in Plasmonic Nanocavities
Authors: Mertens, J
Demetriadou, A
Bowman, RW
Benz, F
Kleemann, ME
Tserkezis, C
Shi, Y
Yang, HY
Hess, O
Aizpurua, J
Baumberg, JJ
Item Type: Journal Article
Abstract: We report the light-induced formation of conductive links across nanometer-wide insulating gaps. These are realized by incorporating spacers of molecules or 2D monolayers inside a gold plasmonic nanoparticle-on-mirror (NPoM) geometry. Laser irradiation of individual NPoMs controllably reshapes and tunes the plasmonic system, in some cases forming conductive bridges between particle and substrate, which shorts the nanometer-wide plasmonic gaps geometrically and electronically. Dark-field spectroscopy monitors the bridge formation in situ, revealing strong plasmonic mode mixing dominated by clear anticrossings. Finite difference time domain simulations confirm this spectral evolution, which gives insights into the metal filament formation. A simple analytic cavity model describes the observed plasmonic mode hybridization between tightly confined plasmonic cavity modes and a radiative antenna mode sustained in the NPoM. Our results show how optics can reveal the properties of electrical transport across well-defined metallic nanogaps to study and develop technologies such as resistive memory devices (memristors).
Issue Date: 16-Aug-2016
Date of Acceptance: 20-Jul-2016
URI: http://hdl.handle.net/10044/1/39636
DOI: https://dx.doi.org/10.1021/acs.nanolett.6b02164
ISSN: 1530-6992
Publisher: American Chemical Society
Start Page: 5605
End Page: 5611
Journal / Book Title: Nano Letters
Volume: 16
Issue: 9
Copyright Statement: This document is the Accepted Manuscript version of a Published Work that appeared in final form in Nano Letters, © 2016 American Chemical Society, after peer review and technical editing by the publisher. To access the final edited and published work see http://dx.doi.org/10.1021/acs.nanolett.6b02164.
Sponsor/Funder: European Office Of Aerospace Research & Developmen
Engineering & Physical Science Research Council (E
The Royal Society
Engineering and Physical Sciences Research Council
Funder's Grant Number: FA9550-14-1-0181
RG72590
IE151097
EP/L027151/1
Keywords: 2D materials
Plasmonic nanocavities
light-induced plasmonic welding
nanoparticle on mirror
plasmonic hybridisation
tuneable plasmonics
Nanoscience & Nanotechnology
MD Multidisciplinary
Publication Status: Published
Appears in Collections:Condensed Matter Theory
Physics
Faculty of Natural Sciences



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