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O: Fachverband Oberflächenphysik

O 59: Plasmonics and Nanooptics

O 59.17: Poster

Tuesday, March 21, 2017, 18:30–20:30, P2-OG1

Near-field imaging and spectroscopy of hybridized plasmonic nanocavities — •Anna-Katharina Mahro¹, Deirdre Kilbane^1,2, Michael Hartelt¹, Tobias Eul¹, Eva Prinz¹, Mirko Cinchetti^1,3, and Martin Aeschlimann¹ — ¹Physics Department and Research Center OPTIMAS, TU Kaiserslautern, Germany — ²School of Physics, University College of Dublin, Ireland — ³Experimentelle Physik VI, TU Dortmund, Germany

Knowledge of fundamental light-matter interactions such as the spectral response of nanostructures to incident light is necessary for designing plasmonic devices. This response is determined on the nanometer scale (below the diffraction limit of light). To achieve this high spatial resolution we use a photoemission electron microscope (PEEM). It images the near-field distribution of the photoelectrons in a parallel data acquisition scheme.

To gain information about the spectral response, we combine PEEM with a highly tunable femtosecond laser source, in our case an optical parametric oscillator (OPO). We demonstrate the potential of this experimental setup by investigating localized, propagating and hybridized surface plasmons in different arrangements of gold whispering gallery mode antennas (WGM) which are fabricated via focussed ion beam milling (FIB).