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MO: Fachverband Molekülphysik

MO 7: Poster: Cluster

MO 7.9: Poster

Monday, March 14, 2011, 16:00–18:00, P1

Field enhancement around gold nanoparticles — •Madjet Mohamed El-Amine — Free University Berlin, Institute of Chemistry and Biochemistry , Fabeckstr. 36a, D-14195 Berlin

Using Time-dependent local density approximation, we investigated the optical properties of small gold nanoparticles. The dynamical response of the valence electrons responsible for the collective excitations is strongly influenced by the polarization of the core electrons [1] through screening effects [2]. This screening results in a shift of the surface plasmon to lower energy. The field enhancement factors were calculated for different nanoparticle sizes. We investigated also the dependence of the field enhancement factor on the distance from the surface of the nanoparticle and on the surrounding medium.

[1] L. Serra and A. Rubio, Phys. Rev. Lett. 78, 1428 (1997)

[2] Lerme et al, Eur. Phys. J. D 4, 95 (1998)