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Phys Rev Lett. 2008 Oct 3;101(14):143902. Epub 2008 Sep 30.

Collective resonances in gold nanoparticle arrays.

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School of Physics, University of Exeter, Stocker Road, Exeter, Devon, EX4 4QL, United Kingdom.


We present experimental evidence of sharp spectral features in the optical response of 2D arrays of gold nanorods. A simple coupled dipole model is used to describe the main features of the observed spectral line shape. The resonance involves an interplay between the excitation of plasmons localized on the particles and diffraction resulting from the scattering by the periodic arrangement of these particles. We investigate this interplay by varying the particle size, aspect ratio, and interparticle spacing, and observe the effect on the position, width, and intensity of the sharp spectral feature.

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