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Tracking Optical Welding through Groove Modes in Plasmonic Nanocavities.

J Mertens¹, A Demetriadou^2,3, R W Bowman¹

¹NanoPhotonics Centre, Cavendish Laboratory, University of Cambridge , Cambridge, CB3 0HE, United Kingdom.

|August 17, 2016

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Light exposure creates conductive pathways across nanoscale gaps in plasmonic nanoparticle-on-mirror systems. This optical method reveals electrical transport properties for developing novel resistive memory devices.

Area of Science:

Nanophotonics
Plasmonics
Molecular Electronics

Background:

Plasmonic nanoparticle-on-mirror (NPoM) geometries enable precise control over nanoscale optical fields.
Conductive bridge formation across insulating gaps is crucial for nanoscale electronic devices.

Purpose of the Study:

To investigate the light-induced formation of conductive links in NPoM systems.
To correlate optical spectroscopy with electrical transport phenomena.
To explore applications in resistive memory devices (memristors).

Main Methods:

Fabrication of gold NPoMs with molecular or 2D monolayer spacers.
In situ monitoring of plasmonic systems using dark-field spectroscopy.
Finite difference time domain (FDTD) simulations for spectral analysis.

Keywords:

2D materials Plasmonic nanocavities light-induced plasmonic welding nanoparticle on mirror plasmonic hybridisation tuneable plasmonics

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Development of an analytic cavity model for plasmonic mode hybridization.

Main Results:

Laser irradiation controllably formed conductive bridges, shorting nanometer-wide gaps.
Dark-field spectroscopy revealed strong plasmonic mode mixing and anticrossings during bridge formation.
FDTD simulations and analytic models confirmed metal filament formation and plasmonic hybridization.

Conclusions:

Optical methods can effectively probe electrical transport across nanoscale metallic gaps.
The study demonstrates a pathway for developing light-tunable resistive memory devices.
Understanding plasmonic-electronic coupling in NPoMs is key for future nanoelectronic applications.