XVIth International Workshop on
Quantum Systems in
Chemistry and Physics
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Plasmonic excitations of metal-atom chain and ring cluster oligomers
Michitoshi Hayashi
Center for Condensed Matter Sciences, National Taiwan University, Taiwan
Plasmonic excitations in metallic nanostructures are fascinating phenomena that are not only rich of physics but also finding many technological applications in e.g., biological sensors and solar cells. Therefore it is important to understand the origin and mechanism of these intriguing plasmon-related phenomena in the metal nanocomposites. In particular, we are interested in how plasmonic excitations can alter the spectroscopy and dynamics of molecules in the vicinity of the metal cluster.
We have recently exploited the interaction between a molecule and the metal-atom cluster systems. We take several chromophore molecules and simple metal-atom systems. For cluster systems, we further consider two particular structures: chain and ring in order to make clear definition of “plasmon-like” excitation. For finite chain systems, unlike infinite systems, charge localization can be found near both boundaries of the chain, which leads to huge transition dipole moment upon excitation. Therefore electronic excitations of molecules in the vicinity of these two boundaries can be affected. For the normal ring systems, on the other hand, there is no charge localization. The characteristics of the ring system is that singlet state becomes unstable if n=4, 8, 12, 16, …. with n being the number of atom. Thus the system will lower the symmetry (Peilers instability) if singlet state is required while triplet state will be stable if the structure is kept. Thus the interaction with molecules will be more complicated and thus the ring systems may be used to control the optical electronic excitation properties of the molecules.



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