Related Experiment Videos
Grating-induced plasmon mode in gold nanoparticle arrays.
N Félidj1, G Laurent, J Aubard
1Laboratoire ITODYS, Université Paris 7-Denis Diderot, CNRS UMR 7086, 1 rue Guy de la Brosse, F-75005 Paris, France. felidj@paris7.jussieu.fr
The Journal of Chemical Physics
|December 27, 2005
Summary
We investigated gold nanoparticle arrays, discovering a new spectral band linked to grating-induced resonance. This resonance is tunable by altering particle properties and arrangement, crucial for plasmonics applications.
Area of Science:
- Plasmonics
- Nanophotonics
- Optical Spectroscopy
Background:
- Gold nanoparticles exhibit surface plasmon resonance.
- Regularly arranged nanoparticles can exhibit collective optical phenomena.
- Dipolar coupling is a key interaction in nanoparticle arrays.
Purpose of the Study:
- To investigate the dipolar coupling in 2D arrays of gold nanoparticles.
- To understand the emergence and tunability of a grating-induced resonance.
- To correlate spectral features with nanoparticle properties and array parameters.
Main Methods:
- Extinction micro-spectroscopy was employed.
- Systematic variation of interparticle spacing, dielectric environment, particle shape, grating constant, and angle of incidence.
- Analysis of spectral shifts and band emergence.
Main Results:
- An additional, narrow band appeared in the extinction spectrum as interparticle spacing approached the plasmon resonance wavelength.
- This grating-induced resonance band's strength and spectral position were influenced by dielectric environment, particle shape, grating constant, and angle of incidence.
- Spectral position correlates with grazing grating orders, and strength with dipolar scattering.
Conclusions:
- Grating-induced resonance in gold nanoparticle arrays is a significant phenomenon.
- The resonance is tunable, offering possibilities for optical device design.
- Understanding dipolar coupling and grating effects is key to controlling plasmonic properties.