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Related Experiment Video

Updated: Sep 21, 2025

Evaluating Plasmonic Transport in Current-carrying Silver Nanowires

Evaluating Plasmonic Transport in Current-carrying Silver Nanowires

Published on: December 11, 2013

Extremely confined gap plasmon modes: when nonlocality matters.

Sergejs Boroviks^1,2,3, Zhan-Hong Lin², Vladimir A Zenin¹

¹Center for Nano Optics, University of Southern Denmark, Campusvej 55, DK-5230, Odense M, Denmark.

Nature Communications

|June 6, 2022

Summary

Researchers explored nonlocal effects in plasmonics using ultrathin gold-aluminum oxide waveguides. They observed nonlocal damping in gap surface plasmon modes, significant for nanoscale dielectric gaps.

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Area of Science:

Condensed Matter Physics
Plasmonics
Nanophotonics

Background:

Plasmonics traditionally uses classical electrodynamics and local-response approximation.
Mesoscopic effects, like nonlocal response, emerge at atomic scales of electromagnetic confinement.
Understanding nonlocal effects is crucial for nanoscale plasmonic devices.

Purpose of the Study:

To investigate nonlocal effects in propagating gap surface plasmon modes.
To study these effects in ultrathin metal-dielectric-metal planar waveguides.
To compare experimental findings with generalized nonlocal optical response theory.

Main Methods:

Fabrication of metal-dielectric-metal waveguides using monocrystalline gold flakes and atomic-layer-deposited aluminum oxide.
Utilizing scanning near-field optical microscopy (SNOM) to probe near-field interactions.
Measuring the dispersion relation via complex-valued propagation constants.

Main Results:

Direct observation of nonlocal effects in propagating gap surface plasmon modes.
Experimental data compared with generalized nonlocal optical response theory.
Identification of nonlocal damping becoming significant for few-nanometer dielectric gaps.

Conclusions:

Nonlocal electrodynamic surface response is observable in nanoscale plasmonic structures.
The generalized nonlocal optical response theory accurately describes these mesoscopic effects.
Findings highlight the importance of nonlocal phenomena in designing nanoscale plasmonic devices.