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Optimizing the electric field around solid and core-shell alloy nanostructures for near-field applications
Luis Montaño-Priede1, Ovidio Peña-Rodríguez, Antonio Rivera
1Instituto de Física, Benemérita Universidad Autónoma de Puebla, Apdo. Postal J-48, Puebla, Puebla 72570, Mexico. upal@ifuap.buap.mx.
Nanoscale
|July 26, 2016
Summary
We studied near-field enhancement in gold-silver alloy nanoparticles (NPs) for optoelectronic devices. Alloy NPs show slightly reduced enhancement but remain viable for applications like surface-enhanced spectroscopies and plasmon-enhanced OLEDs.
Area of Science:
- Plasmonics
- Nanotechnology
- Materials Science
Background:
- Near electric field enhancement around plasmonic nanoparticles (NPs) is crucial for surface-enhanced spectroscopies, dye-sensitized solar cells, and organic light-emitting diodes (OLEDs).
- Understanding field behavior is key for optimizing these near-field applications.
Purpose of the Study:
- To calculate and analyze near-field enhancement in solid and core-shell gold-silver alloy NPs.
- To investigate the influence of geometrical parameters and composition on field enhancement.
- To compare alloy NP performance with pure silver NPs.
Main Methods:
- Computational analysis of near-field enhancement.
- Varying geometrical parameters and alloy composition (AuxAg1-x).
- Investigating solid and core-shell (AuxAg1-x@SiO2) nanostructures.
Main Results:
- AuxAg1-x alloy NPs exhibit lower near-field enhancement than pure silver NPs but are still effective.
- Higher-order multipolar modes decay spatially faster, influencing the near-field.
- In core-shell structures, quadrupolar modes dominate near the core, while dipolar modes are prevalent around the shell.
- Localized Surface Plasmon Resonance (LSPR) behavior can differ in near- and far-fields, especially for larger particles with high silver content.
Conclusions:
- Gold-silver alloy NPs are suitable for near-field applications, though enhancement is slightly reduced compared to pure silver.
- The distinct near- and far-field LSPR behaviors necessitate careful design of plasmonic nanostructures.
- Results inform the application of alloy NPs in surface-enhanced spectroscopies and plasmon-based optoelectronics.
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