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Gold nanobelts as high confinement plasmonic waveguides
Lindsey J E Anderson1, Yu-Rong Zhen, Courtney M Payne
1Department of Physics and Astronomy, ‡Department of Chemistry, Rice University , 6100 Main Street, Houston, Texas 77005, United States.
Nano Letters
|November 12, 2013
Summary
Surface plasmon polaritons in thin waveguides are hard to study due to damping. We found a weakly excited mode in gold nanobelts with over 10 μm propagation length and strong confinement, demonstrating potential for advanced plasmonic devices.
Area of Science:
- Plasmonics
- Nanophotonics
- Materials Science
Background:
- Surface plasmon polaritons (SPPs) in thin plasmonic waveguides exhibit strong damping.
- Studying SPP propagation is challenging with conventional diffraction-limited optical methods.
Purpose of the Study:
- To directly characterize plasmon propagation in thin gold nanobelts.
- To investigate the potential for achieving long propagation lengths and strong confinement in nanostructured plasmonic waveguides.
Main Methods:
- Direct characterization of plasmon propagation using incoherent light.
- Analysis of plasmon propagation in gold nanobelts.
Main Results:
- SPP propagation in gold nanobelts shows a short average propagation length of 0.94 μm.
- A weakly excited antisymmetric mode was observed with a propagation length exceeding 10 μm.
- This mode demonstrated strong spatial confinement, with an area of 2400 nm².
Conclusions:
- Thin plasmonic structures can support modes with significant propagation lengths and high spatial confinement.
- The antisymmetric mode in gold nanobelts offers a promising pathway for developing advanced plasmonic devices with enhanced performance.
