Regensburg 2013 – scientific programme

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O: Fachverband Oberflächenphysik

O 19: Plasmonics and Nanooptics II

O 19.7: Talk

Monday, March 11, 2013, 17:30–17:45, H31

Chiral Plasmonic Realization of the Born-Kuhn Model — •Xinghui Yin, Martin Schäferling, and Harald Giessen — 4th Physics Institut, Research Center SCoPE, and Research Center SimTech, University of Stuttgart, Stuttgart, Germany

In recent years, chiral assemblies of plasmonic nanostructures and their associated optical spectra have gained considerable interest [1]. This is due to their ability to generate optical rotatory dispersion (ORD) and circular dichroism (CD) that is orders of magnitude larger than for any naturally occurring substance. Drawing inspiration from the classical theories of optical activity, we investigate a plasmonic version of the most basic system exhibiting chiroptical responses: two coupled anisotropic oscillators that are vertically displaced with respect to each other, known as the Born-Kuhn model [2,3]. It was originally developed to describe two-chromophore coupling in optically active molecules, where each chromophore by itself is achiral. We experimentally realize the Born-Kuhn model of chiral media in a plasmonic system of corner-stacked nanorods and discuss the arising spectra in terms of hybridized modes and retardation effects.

[1] A. Kuzyk et al., Nature 483, 311 (2012).

[2] M. Born, Z. Phys. A - Hadron Nucl. 16, 251 (1922).

[3] W. Kuhn, T. Faraday Soc. 26, 293 (1930).