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On long-range plasmonic modes in metallic gaps.

David F P Pile, Dmitri K Gramotnev, Rupert F Oulton

|June 25, 2009

Summary

This study re-evaluates long-range surface plasmon-polariton modes in wide gold film gaps. Findings suggest these are not guided modes but rather bulk waves and surface plasmons.

Area of Science:

Photonics and Plasmonics
Optical Waveguides
Materials Science

Background:

Previous research reported long-range surface plasmon-polariton eigenmodes in wide rectangular gaps within gold films.
These modes were purportedly guided by gaps of 6 to 12 micrometers in 400 nm thick gold films at a vacuum wavelength of 1.55 micrometers.

Purpose of the Study:

To conduct a detailed numerical analysis of plasmonic modes in gap plasmon waveguides.
To investigate the existence and nature of the long-range surface plasmon-polariton eigenmodes reported in prior studies.

Main Methods:

Numerical analysis of plasmonic modes within specified gold film gap structures.
Simulation of wave propagation and mode characteristics using established optical modeling techniques.

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Main Results:

The detailed numerical analysis indicates that no true long-range eigenmodes exist in these gap plasmon waveguides.
The previously reported "modes" are likely composed of beams of bulk waves and surface plasmons.
The findings contradict the existence of guided modes in the investigated structures.

Conclusions:

The existence of long-range surface plasmon-polariton eigenmodes in wide gold film gaps, as previously reported, is refuted by this numerical analysis.
The observed phenomena are reinterpreted as a combination of bulk waves and surface plasmons, not guided modes.
This research clarifies the behavior of plasmonic modes in such waveguide configurations.