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Anisotropic effective medium properties from interacting Ag nanoparticles in silicon dioxide
Applied Optics
|June 13, 2014
Summary
This study explores Ag nanoparticles in SiO₂ films, revealing two surface plasmon resonance (SPR) peaks. The anisotropic SPR behavior is linked to nanoparticle coupling and electric field direction.
Area of Science:
- Materials Science
- Nanotechnology
- Optics
Background:
- Thin films with embedded metal nanoparticles exhibit unique optical properties.
- Surface Plasmon Resonance (SPR) is sensitive to nanoparticle size, shape, and surrounding dielectric environment.
Purpose of the Study:
- To investigate the anisotropic behavior of surface plasmon resonance (SPR) in Ag/SiO₂ composite films.
- To correlate SPR peak shifts with structural properties and inter-nanoparticle coupling.
Main Methods:
- Fabrication of Ag nanoparticles embedded in SiO₂ films using RF magnetron sputtering.
- Optical transmittance measurements at various angles of incidence (0° to 75°).
- Structural characterization using transmission electron microscopy (TEM).
Main Results:
- Two SPR peaks were observed: one in the UV and a red-shifted peak near 410 nm.
- TEM revealed a 2D distribution of nearly spherical Ag nanoparticles.
- A modified Drude-Lorentz dielectric function within the Maxwell-Garnett relation successfully modeled the anisotropic SPR behavior.
Conclusions:
- The observed anisotropic SPR is attributed to the coupling of plasmon oscillations between adjacent Ag nanoparticles.
- The developed model accurately predicts SPR positions based on nanoparticle distribution and incidence angle.
- This work provides insights into tailoring optical properties of plasmonic nanocomposite films.
