Anomaly in the relaxation dynamics close to the surface plasmon resonance

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 i...

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Bibliographic Details
Published in:Europhysics letters 2007-04, Vol.78 (2), p.27002
Main Authors: Weick, G, Weinmann, D, Ingold, G.-L, Jalabert, R. A
Format: Article
Language:English
Subjects:
71.45.Gm
73.20.Mf
78.67.-n
Condensed Matter
Mesoscopic Systems and Quantum Hall Effect
Physics
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Summary: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 nano- particles.
ISSN:0295-5075
1286-4854
DOI:10.1209/0295-5075/78/27002