Propagation of optical excitations by dipolar interactions in metal nanoparticle chains

Details Propagation of optical excitations by dipolar interactions in metal nanoparticle chains Propagation of optical excitations by dipolar interactions in metal nanoparticle chains

2004-07-31

arxiv.org/abs/physics/0408003v2

Physical Review B, Vol. 70, 125429 (2004)

Physics

Optics

26 pages, 7 figures, 2 tables. to appear in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.70.125429

Dispersion relations for dipolar modes propagating along a chain of metal nanoparticles are calculated by solving the full Maxwell equations, including radiation damping. The nanoparticles are treated as point dipoles, which means the results are valid only for a/d <= 1/3, where a is the particle radius and d the spacing. The discrete modes for a finite chain are first calculated, then these are mapped onto the dispersion relations appropriate for the infinite chain. Computed results are given for a chain of 50-nm diameter Ag spheres spaced by 75 nm. We find large deviations from previous quasistatic results: Transverse modes interact strongly with the light line. Longitudinal modes develop a bandwidth more than twice as large, resulting in a group velocity that is more than doubled. All modes for which k_mode <= w/c show strongly enhanced decay due to radiation damping.

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