Directional plasmonic scattering from metal nanoparticles in thin-film environments

作者：Powell A W^*; Hjerrild N; Watt A A R; Assender H E; Smith J M

来源：Applied Physics Letters, 2014, 104(8): 081110.

DOI：10.1063/1.4866669

The effect of a low refractive index film on plasmonic scattering from individual silver nanoparticles and nanowires is observed experimentally in Fourier space. The addition of the film over particles on a glass substrate was found to have a strong effect on the scattering pattern, due to interference between directly scattered light and light reflected from the interfaces, which depends strongly on the film thickness. Nanowires are shown to produce a much more directional scattering pattern than spherical particles, and the addition of the film above the nanowires leads to further directionality enhancements with light scattering at well-defined angles into the glass substrate. The use of the dielectric environment and particle shape to tune the directional scattering is demonstrated. These results are of interest for applications such as optical nanoantennae and plasmonically enhanced solar cells.

• 出版日期2014-2-24