Dresden 2006 – wissenschaftliches Programm

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O: Oberflächenphysik

O 29: Poster session II (Nanostructures, Magnetism, Particles and clusters, Scanning probe techniques, Time-resolved spectroscopy, Structure and dynamics, Semiconductor surfaces and interfaces, Oxides and insulators, Solid-liquid interfaces)

O 29.21: Poster

Mittwoch, 29. März 2006, 14:30–17:30, P2

Calculation of radiation damping of plasmons in prolate gold nanoparticles — •Christian Dahmen, Stefan Becker, and Gero von Plessen — Nanostructure Optics Group, I. Physikalisches Institut (IA), RWTH Aachen, 52056 Aachen

Plasmon resonances of non-spherical noble-metal nanoparticles are of interest for possible applications in plasmon-enhanced spectroscopy, such as surface-enhanced Raman scattering. Theoretical work has mainly focussed on calculating the spectral position of the plasmon resonance and the optical field enhancement for irregularly shaped particles. In this work, we discuss how the radiation damping rate of prolate spheroidal gold nanoparticles depends on volume and shape of the particles. The separation of variables method [1] is employed to calculate their scattering cross sections. The contribution of the radiative plasmon decay to the total linewidth of the plasmon resonance is determined. We find that the radiative decay rate depends sensitively on both the particle volume and the aspect ratio.

[1] S. Asano and G. Yamamoto, Appl. Opt. 14, 29-49 (1975)