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Evaluating Plasmonic Transport in Current-carrying Silver Nanowires
Published on: December 11, 2013
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Standing wave plasmon modes interact in an antenna-coupled nanowire
Jared K Day1, Nicolas Large, Peter Nordlander
1Department of Electrical and Computer Engineering, ‡Department of Physics, §Department of Chemistry, ∥Laboratory for Nanophotonics, and the Rice Quantum Institute, Rice University , MS-378, 6100 Main Street, Houston, Texas 77005, United States.
Nano Letters
|January 8, 2015
Summary
Metallic nanowires act like optical cavities. Coupling these nanowires with nanoantennas controls their plasmon modes, enabling manipulation of light-matter interactions.
Area of Science:
- Plasmonics
- Nanophotonics
- Nonlinear Optics
Background:
- Standing wave optical cavities exhibit complex nonlinear dynamics due to mode coupling.
- Finite-length metallic nanowires possess longitudinal surface plasmon modes, analogous to a Fabry-Pérot cavity.
- Coupling between optical modes can lead to phenomena like frequency pushing/pulling and chaotic behavior.
Purpose of the Study:
- To investigate the coupling of standing-wave plasmon modes in metallic nanowires.
- To demonstrate how plasmonic nanoantennas can mediate interactions between nanowire plasmon modes.
- To explore the control of plasmon mode behavior through nanoantenna design.
Main Methods:
- Positioning metallic nanowires within the gap of plasmonic nanoantennas.
- Utilizing hybridization-based coupling between nanowire plasmon modes and the antenna structure.
- Analyzing the effects of nanoantenna position and shape on plasmon mode characteristics.
Main Results:
- Passive coupling of nanowire plasmon modes mediated by the nanoantenna.
- Demonstration of interaction between individual nanowire plasmon modes.
- Observation of frequency pushing and pulling effects.
- Enhancement and suppression of specific plasmon modes controlled by nanoantenna geometry.
Conclusions:
- Plasmonic nanoantennas can effectively couple and mediate interactions between standing-wave plasmon modes in metallic nanowires.
- Nanoantenna position and shape offer a means to control and manipulate plasmon mode behavior, including frequency shifts and mode selectivity.
- This hybridization-based coupling provides a pathway for controlling nonlinear optical phenomena in plasmonic nanostructures.
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