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Tailoring the coupling between localized and propagating surface plasmons: realizing Fano-like interference and

Wenzhen Ren¹, Yanmeng Dai, Hongbing Cai

¹Department of Physics, University of Science and Technology of China, Hefei 230026, China.

|April 24, 2013

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We explored surface plasmon interactions in gold nanostructures for enhanced light control. This research offers a tunable plasmonic system with high sensitivity for sensing and other applications.

Area of Science:

Plasmonics
Nanophotonics
Materials Science

Background:

Metallic nanostructures exhibit unique surface plasmon modes for light confinement and enhancement.
These tunable plasmonic properties are valuable for applications like sensing, solar cells, and lasing.

Purpose of the Study:

To investigate the interaction between localized and propagating surface plasmons.
To design and analyze a plasmonic structure comprising a gold nanobar array and a gold film.
To tailor spectral properties and enhance sensing capabilities.

Main Methods:

Fabrication of a plasmonic structure with a gold nanobar array separated from a gold film by a silica spacer.
Analysis of reflection spectra by varying nanobar size, array period, and spacer thickness.

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Characterization of localized and propagating surface plasmon coupling.

Main Results:

The reflection spectrum is tunable by adjusting structural parameters (nanobar size, period, spacer thickness).
Strong coupling between localized and propagating modes leads to anticrossing behavior and Fano-like lineshapes.
Achieved high sensitivity (936 nm/RIU) and figure of merit (FoM = 112) for the plasmonic system.

Conclusions:

Demonstrated a controllable method for designing plasmonic systems with tailored mode coupling and spectral features.
The developed system shows significant potential for advanced sensing applications.
Offers a simple and efficient approach for creating functional plasmonic devices.