Systemically tuning the surface plasmon resonance of high-density silver nanoparticle films*
Institute of Sciences, PLA University of Science and
2 National Laboratory of Solid State Microstructures and Department of Materials Science and Engineering, Nanjing University, Nanjing 210093, P.R. China
Received in final form: 17 December 2012
Published online: 30 April 2013
A systemical modulation on the frequency of the surface plasmon resonance (SPR) band of high density silver nanoparticle arrays is demonstrated by depositing gas phase silver clusters on substrate surface with a controlled particle coverage under in-situ SPR spectra monitoring. With increasing the density of the Ag nanoparticles, the SPR wavelength shows a redshift from less than 400 nm to more than 570 nm. The tuning of the SPR wavelength is found to correlate to the increase of the fraction of closely spaced nanoparticle pairs that are near-field coupled with the deposition mass. The coverage dependent SPR properties are also compared with the results from discrete dipole approximation (DDA) calculations.
© EDP Sciences, Società Italiana di Fisica and Springer-Verlag 2013