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Au@Ag Core-Shell Nanorods Support Plasmonic Fano Resonances
Ovidio Peña-Rodríguez1,2, Pablo Díaz-Núñez3, Guillermo González-Rubio4
1Instituto de Fusión Nuclear "Guillermo Velarde", Universidad Politécnica de Madrid, Madrid, Spain. ovidio.pena@upm.es.
Scientific Reports
|April 5, 2020
Summary
We explored gold-silver core-shell nanorods (Au@Ag NRs) and their plasmonic Fano resonances (FRs). These nanostructures show potential for advanced plasmonic sensors and metamaterials.
Area of Science:
- Plasmonics
- Nanotechnology
- Materials Science
Background:
- Core-shell nanostructures offer tunable optical properties.
- Fano resonances arise from the interference of distinct plasmonic modes.
Purpose of the Study:
- Investigate plasmonic Fano resonances (FRs) in gold-silver core-shell nanorods (Au@Ag NRs).
- Characterize the origins and tunability of these FRs.
- Assess the potential applications of Au@Ag NRs.
Main Methods:
- Colloidal synthesis of Au@Ag NRs.
- Experimental investigation of plasmonic properties.
- Theoretical analysis of Fano resonance mechanisms.
Main Results:
- Observed two distinct Fano resonances in Au@Ag NRs.
- Identified a high-energy FR (3.7 eV) from nanoparticle plasmon modes and gold interband transitions.
- Characterized a tunable low-energy FR (2.92-2.75 eV) from silver shell LSPR and nanostructure transversal plasmon modes.
Conclusions:
- Au@Ag NRs exhibit unique plasmonic Fano resonances.
- The distinct FRs are linked to specific plasmonic interactions and material properties.
- These nanorods are promising for plasmonic sensors and metamaterials.
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