Anomaly in the relaxation dynamics close to the surface plasmon resonance

Details Anomaly in the relaxation dynamics close to the surface plasmon resonance Anomaly in the relaxation dynamics close to the surface plasmon resonance

2006-12-06

arxiv.org/abs/cond-mat/0612141v2

Europhys. Lett. 78, 27002 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

version published in EPL

Scientific paper

10.1209/0295-5075/78/27002

We propose an explanation for the anomalous behaviour observed in the relaxation dynamics of the differential optical transmission of noble-metal nanoparticles. Using the temperature dependences of the position and the width of the surface plasmon resonance, we obtain a strong frequency dependence in the time evolution of the transmission close to the resonance. In particular, our approach accounts for the slowdown found below the plasmon frequency. This interpretation is independent of the presence of a nearby interband transition which has been invoked previously. We therefore argue that the anomaly should also appear for alkaline nanoparticles.

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