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Journal Article

Effect of electromagnetic interactions on plasmon excitations in silver particle ensembles

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Benia,  Hadj-Mohamed
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Nilius,  Niklas
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Freund,  Hans-Joachim
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Citation

Benia, H.-M., Nilius, N., & Freund, H.-J. (2006). Effect of electromagnetic interactions on plasmon excitations in silver particle ensembles. Surface Science Letters, 600(10), L128-L133. doi:10.1016/j.susc.2006.03.010.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0011-048C-D
Abstract
The optical properties of silver nano-particle ensembles are studied as a function of particle density by analyzing the light emission excited via electron injection from an STM tip. The particles are prepared with distinct dome and disk-like shapes on a Al2O3/NiAl(1 1 0) support. The particle density is varied over one order of magnitude by changing the Ag deposition temperature and the defect concentration in the oxide surface. With increasing density, a pronounced blue shift of the Ag plasmon mode is observed for ensembles of dome-like particles, whereas disk-like particles show relatively constant resonance energies. The observed evolution of plasmon energy as a function of particle density reflects the influence of electromagnetic interactions in the ensemble, as verified by model calculations.