A unique phenomenon of interparticle electromagnetic coupling in closely spaced gold nanoparticles has been observed by probing the ultrafast electron dynamics of spherical gold nanoparticles with those of a gold-necklace nanoparticle system. Electron−electron scattering and electron−phonon relaxation (two main aspects of electron dynamics) are found to be significantly different for gold-necklace particles when compared to spherical gold nanoparticles. On inter band gap excitation, appreciably slower and pump-power independent electron−electron scattering has been observed for necklace particles (∼500 fs for Au-neck compared to ∼200 fs for Au-spherical nanoparticles). Significantly slower pump-power dependent electron−phonon relaxation has also been observed for the necklace particle system. The electron dynamics for gold-necklace particles is quite unique, and existing models of electron−electron scattering and electron−phonon relaxation were unsuccessful in explaining the dynamics in this system. The results are thus explained by incorporating efficient dipolar electronic coupling between the neighboring nanoparticles.
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Ramakrishna et al. (2007) studied this question.
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