Dresden 2014 – scientific programme

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O: Fachverband Oberflächenphysik

O 37: Posters: Plasmonics, Electronic Structure and Spin-Orbit Interaction, Semiconductor and Insulator Surfaces, Nanostructures

O 37.38: Poster

Tuesday, April 1, 2014, 18:30–22:00, P2

Spatial and spectral near-field distributions of strongly coupled plasmons — •Florian Schertz, Martin Lehr, Hans-Joachim Elmers, and Gerd Schönhense — Johannes Gutenberg Universität Mainz, Institut für Physik, Staudinger Weg 7, 55128 Mainz

The mutual interaction of plasmons results in a strongly enhanced and confined near-field in the interspace between the plasmon supporting structures. The spectral near-field distribution is known to deviate from the corresponding far-field characteristics for strongly coupled plasmons with interspace (gap) sizes in the sub-nm range [1]. To understand the origin of this difference, we calculated the phase distribution of the electric near-field of strongly coupled plasmons at specific excitation frequencies numerically. From the phase distribution the charge distribution at specific instants of time can be derived. The obtained multipole-like distribution of the near-field gives rise to a spatial-dependence of the near-field enhancement in the gap of the plasmon-supporting structures. The results are discussed for various systems of strongly coupled plasmons in dependence of characteristic parameters such as e.g. gap size, particle size and particle aspect ratio. [1] F. Schertz et al., Nano Lett. 12 (4), 1885, (2012).