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Propagation of optical excitations by dipolar interactions in metal nanoparticle chains

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Weber, W. H., Ford, G. W.·2004·Physical Review B

Abstract

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 $a∕d\ensuremath{\leqslant}\frac{1}{3}$, 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 $50\phantom{\rule{0.3em}{0ex}}\mathrm{nm}\phantom{\rule{0.2em}{0ex}}\mathrm{diam}$ Ag spheres spaced by $75\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$. 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 ${k}_{\text{mode}}\ensuremath{\leqslant}\ensuremath{\omega}∕c$ show strongly enhanced decay due to radiation damping.

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Metadata

Authors
Weber, W. H., & Ford, G. W.
Venue
Physical Review B
Published
2004-09-30
Volume
70
Issue
12
ISSN
  • 1098-0121 (ISSN-L)
  • 1550-235X
OpenAlex
W2040707344
Cited by
422
References
9
FWCI
14.13
Type
journal article
Language
en
Open access
green

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CoChat. (2026). Citation check: Propagation of optical excitations by dipolar interactions in metal nanoparticle chains. https://app.cochat.ai/papers/10.1103/physrevb.70.125429
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Weber, W. H., & Ford, G. W. (2004). Propagation of optical excitations by dipolar interactions in metal nanoparticle chains. Physical Review B. https://doi.org/10.1103/physrevb.70.125429

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