Regensburg 2010 – scientific programme
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O: Fachverband Oberflächenphysik
O 59: Poster Session II (Nanostructures at surfaces: Dots, particles, clusters; Nanostructures at surfaces: arrays; Nanostructures at surfaces: Wires, tubes; Nanostructures at surfaces: Other; Plasmonics and nanooptics; Metal substrates: Epitaxy and growth; Metal substrates: Solid-liquid interfaces; Metal substrates: Adsoprtion of organic / bio molecules; Metal substrates: Adsoprtion of inorganic molecules; Metal substrates: Adsoprtion of O and/or H; Metal substrates: Clean surfaces; Density functional theory and beyond for real materials)
O 59.25: Poster
Wednesday, March 24, 2010, 17:45–20:30, Poster B1
Excitation of plasmonic gap waveguides by nano antennas — •Jing Wen1,2, Peter Banzer1,2,3, Daniel Ploss1,2, Arian Kriesch1,2, and Ulf Peschel1,2,3 — 1Institute of Optics, Information and Photonics, University Erlangen-Nuremberg — 2Max Planck Institute for the Science of Light — 3Cluster of Excellence 'Engineering of Advanced Materials' at the University of Erlangen-Nuremberg
We experimentally demonstrate the excitation of plasmonic gap waveguides by nano antennas. The excitation is shown to be both spatially and spectrally dependent which can potentially be used for the selective excitation of plasmonic nanostructures. Due to its small size the antenna can be easily integrated into plasmonic circuits.
The simulated optimized coupling efficiency of exciting with antenna is 10.6% which is 129 times as large as the case without antenna. In experiments, the coupling of the far field to the plasmonic waveguide can only be successfully achieved when the optical beam is on the antenna and at resonant wavelength with the right polarization direction. The measured sum of the coupling efficiency and antenna absorption reaches up to 20% compared to the simulated optimum value of coupling efficiency of 10%. The offset between the simulated coupling efficiency and the experimentally determined lack of power is quite likely due to absorption in the antenna or a higher coupling efficiency than expected.