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O: Fachverband Oberflächenphysik

O 5: Plasmonics: Nanoantennas, Nanoparticles

O 5.4: Vortrag

Montag, 16. März 2015, 11:15–11:30, MA 042

Photoelectron imaging of resonant modes of plasmonic antennas — •Anna-Katharina Mahro, Deirdre Kilbane, Pascal Melchior, Stefan Mathias, and Martin Aeschlimann — Physics Department and Research Centre OPTIMAS, University of Kaiserslautern, Germany

Knowledge of fundamental light-matter interactions such as the local response of nanostructures to incident light is necessary for designing plasmonic devices such as biosensors. This response is determined on the nanometer scale (below the diffraction limit of light). To achieve high spatial resolution we use a photoemission electron microscope (PEEM) in combination with different laser sources for excitation.

To gain information about the spectral properties of the nanoantennas we apply two approaches in the time and frequency domain. The time domain experiment involves phase-resolved interferometric PEEM using a broadband ultrashort pulse laser. The frequency domain experiment is wavelength dependent PEEM using a narrow bandwidth highly tuneable laser source, in our case an optical parametric oscillator (OPO). Comparing spectra from both techniques gives us insight into the local response of our nanoantennas.