Light scattering from disordered overlayers of metallic nanoparticles

Details Light scattering from disordered overlayers of metallic nanoparticles Light scattering from disordered overlayers of metallic nanoparticles

2001-05-31

arxiv.org/abs/cond-mat/0105624v1

Phys. Rev. B 64, 165405 (2001).

Physics

Condensed Matter

19 pages, 12 figures

Scientific paper

10.1103/PhysRevB.64.165405

We develop a theory for light scattering from a disordered layer of metal nanoparticles resting on a sample. Averaging over different disorder realizations is done by a coherent potential approximation. The calculational scheme takes into account effects of retardation, multipole excitations, and interactions with the sample. We apply the theory to a system similar to the one studied experimentally by Stuart and Hall [Phys. Rev. Lett. {\bf 80}, 5663 (1998)] who used a layered Si/SiO$_2$/Si sample. The calculated results agree rather well with the experimental ones. In particular we find conspicuous maxima in the scattering intensity at long wavelengths (much longer than those corresponding to plasmon resonances in the particles). We show that these maxima have their origin in interference phenomena in the layered sample.

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