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Evaluating Plasmonic Transport in Current-carrying Silver Nanowires
Published on: December 11, 2013
Surface Plasmon Resonance from Bimetallic Interface in Au-Ag Core-Shell Structure Nanowires.
1Non-Equilibrium Condensed Matter and Quantum Engineering Laboratory, The Key Laboratory of Ministry of Education, School of Science, Xi'an Jiaotong University, Xi'an, 710049 China.
Nanoscale Research Letters
|July 3, 2010
Summary
Investigating gold-silver (Au-Ag) and silver-gold (Ag-Au) core-shell nanowires revealed two distinct surface plasmon resonances (SPR). Thickness impacts these SPR bands differently, with implications for understanding bimetallic nanoparticle behavior.
Area of Science:
- Nanophotonics
- Materials Science
- Surface Physics
Background:
- Core-shell nanostructures offer tunable optical properties.
- Surface Plasmon Resonances (SPR) are crucial for sensing and optical applications.
- Bimetallic systems present complex plasmonic behaviors.
Purpose of the Study:
- To investigate transverse surface plasmon resonances (SPR) in Au-Ag and Ag-Au core-shell nanowires.
- To analyze the influence of wall thickness on distinct SPR bands.
- To elucidate the underlying mechanism of SPR shifts in bimetallic interfaces.
Main Methods:
- Utilized quasi-static theory for theoretical investigation.
- Modeled bimetallic core-shell nanowire structures (Au-Ag, Ag-Au).
- Analyzed SPR band behavior as a function of wall thickness.
Main Results:
- Identified two SPR bands: one from the outer surface, one from the core-wall interface.
- Interface SPR decreased and shifted significantly with increasing wall thickness.
- Outer surface SPR increased and shifted slightly with increasing wall thickness.
- Developed a model based on oscillatory surface electrons and coulombic forces.
Conclusions:
- Wall thickness critically influences SPR characteristics in bimetallic core-shell nanowires.
- Distinct SPR behaviors arise from the outer surface versus the bimetallic interface.
- Coulombic forces and net charges within the metallic wall govern SPR energy and shifts.
