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Mode-Selective Plasmon Coupling between Au Nanorods and Au Nanospheres
1Department of Chemistry, Chung-Ang University, 84 Heukseok-ro, Seoul 06974, Korea.
The Journal of Physical Chemistry Letters
|November 6, 2023
Summary
Researchers studied plasmon coupling between gold nanorods (AuNRs) and gold nanospheres (AuNSs). They found that the arrangement of AuNSs around AuNRs dictates the plasmonic interactions and spectral shifts.
Area of Science:
- Plasmonics
- Nanophotonics
- Materials Science
Background:
- Plasmons in gold nanoparticles (AuNPs) are crucial for their optical properties.
- Neighboring AuNPs exhibit plasmon coupling, leading to hybridized modes and red-shifted spectra.
- Prior research primarily focused on plasmon coupling between spherical AuNPs (AuNSs).
Purpose of the Study:
- To investigate plasmonic interactions between AuNSs and anisotropic gold nanorods (AuNRs).
- To understand how directional coupling affects longitudinal (LO) and transverse (TR) plasmon modes in AuNRs.
- To provide guidelines for selective plasmon excitation in nanogaps.
Main Methods:
- Assembly of AuNSs around AuNRs (AuNR@AuNS).
- Selective binding of AuNSs to AuNR ends (AuNR═AuNS).
- Analysis of extinction spectra to observe plasmon mode shifts.
- Computational simulations to elucidate coupling mechanisms.
Main Results:
- Assembly of AuNSs around AuNRs resulted in shifts of both LO and TR modes due to directional coupling.
- Selective binding of AuNSs to AuNR ends favored predominant LO plasmon coupling.
- Simulations confirmed exclusive LO or TR coupling based on precise AuNS attachment points on AuNRs.
Conclusions:
- The spatial arrangement of AuNSs around AuNRs significantly influences plasmon coupling.
- Directional plasmon coupling can be controlled by the selective assembly of nanostructures.
- This work offers a strategy for tuning plasmon resonances in complex nanoparticle systems.
