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O: Fachverband Oberflächenphysik

O 85: Plasmonics and nanooptics V

O 85.5: Talk

Friday, March 30, 2012, 11:30–11:45, MA 005

Plasmon resonances in atomic-scale gaps — •Johannes Kern¹, Swen Grossmann¹, Tim Häckel¹, Nadezda Tarakina^{2, 3}, Monika Emmerling³, Martin Kamp³, Jer-Shing Huang⁴, Paolo Biagioni⁵, Jord C. Prangsma¹, and Bert Hecht¹ — ¹Experimental Physics 5, University of Würzburg, Germany — ²Experimental Physics 3, University of Würzburg, Germany — ³Technical Physics, University of Würzburg, Germany — ⁴Department of Chemistry, National Tsing Hua University, Taiwan — ⁵Dipartimento di Fisica, Politecnico di Milano, Italy

We experimentally investigate the plasmon resonances of side-by-side aligned single-crystalline gold nanorod dimers. Robust gaps between the particles reaching well below 1 nm are obtained by reproducible self-assembly. For such atomic-scale gaps extreme splitting of the symmetric and anti-symmetric dimer eigenmodes is observed in white-light scattering experiments.

Besides providing evidence for atomic-scale gap modes at visible wavelengths with correspondingly small mode volumes, our experimental results can serve as a benchmark for electromagnetic modeling beyond local Maxwell theory.