Tunability of the optical absorption in small silver cluster-polymer hybrid systems

Details Tunability of the optical absorption in small silver cluster-polymer hybrid systems Tunability of the optical absorption in small silver cluster-polymer hybrid systems

2010-03-10

arxiv.org/abs/1003.2183v3

Physics

Condensed Matter

Materials Science

Updated layout and minor changes in versions 2 and 3

Scientific paper

We have calculated the absorption characteristics of different hybrid systems consisting of Ag, Ag2 or Ag3 atomic clusters and poly(methacrylic acid) (PMAA) using the time-dependent density-functional theory. The polymer is found to have an extensive structural-dependency on the spectral patterns of the hybrid systems relative to the bare clusters. The absorption spectrum can be `tuned' to the visible range for hybrid systems with an odd number of electrons per silver cluster, whereas for hybrid systems comprising an even number of electrons, the leading absorption edge can be shifted up to about 4.5 eV. The results give theoretical support to the experimental observations on the absorption in the visible range in metal cluster-polymer hybrid structures.

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