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A Technique to Functionalize and Self-assemble Macroscopic Nanoparticle-ligand Monolayer Films onto Template-free Substrates
Published on: May 9, 2014
Seeing double: coupling between substrate image charges and collective plasmon modes in self-assembled nanoparticle
Pattanawit Swanglap1, Liane S Slaughter, Wei-Shun Chang
1Department of Chemistry, Laboratory for Nanophotonics, Rice University, Houston, Texas 77005, United States.
ACS Nano
|May 13, 2011
Summary
Substrate properties significantly influence plasmon scattering in gold nanoparticle rings. The permittivity of the substrate affects collective plasmon modes, causing image splitting in scattered light.
Area of Science:
- Nanophotonics and Plasmonics
- Materials Science
Background:
- Adjacent metal nanoparticles exhibit collective plasmonic properties.
- Substrate interactions can modify nanoparticle plasmon behavior.
Purpose of the Study:
- Investigate substrate-dependent plasmon scattering in gold nanoparticle rings.
- Understand the role of substrate permittivity in plasmonic interactions.
Main Methods:
- Dark-field imaging of plasmon scattering.
- Analysis of intensity line profiles and polarization dependence.
- Systematic variation of substrate materials (carbon, gold, glass).
Main Results:
- Observed "splitting" of nanoparticle ring images on high-permittivity substrates (carbon, gold).
- Broadening and intensity dip in line profiles beyond optical resolution.
- Effect correlated with substrate permittivity and excitation light polarization.
Conclusions:
- The observed splitting is attributed to the coupling of collective plasmon modes with substrate-induced image charges.
- Substrate permittivity spatially modulates plasmon scattering in extended nanostructures.
- Tuning substrate permittivity offers a method to control plasmonic behavior in nanostructures.
