Regensburg 2013 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 19: Plasmonics and Nanooptics II
O 19.5: Vortrag
Montag, 11. März 2013, 17:00–17:15, H31
Coherent control of plasmon propagation in top-down fabricated optical nano-circuits — •Monika Pawłowska1, Christian Rewitz1, Sebastian Goetz1, Peter Geisler2, Gary Razinskas2, Enno Krauss2, Bert Hecht2,3, and Tobias Brixner1,3 — 1Institut für Physikalische und Theoretische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany — 2Nano-Optics and Biophotonics Group, Experimentelle Physik 5, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany — 3Röntgen Center for Complex Material Systems (RCCM), Am Hubland, 97074 Würzburg, Germany
Plasmonic modes supported by noble-metal nanostructures offer strong subwavelength confinement and promise the realization of nanometer-scale integrated optical circuits with well-defined functionality. The coherent control of spatial and temporal energy distribution within a nanostructure is also of high interest. Here, we present the experimental realization of such a coherent control scheme exploiting the interaction of two plasmonic modes propagating on a single gold nano-structure. The structure consists of an input antenna attached to a two-wire transmission line that splits into two branches. It was optimized by finite-difference frequency-domain (FDFD) simulations and fabricated by focused ion-beam milling (FIB). Upon illumination of the antenna with two perpendicularly polarized ultrashort laser pulses two modes can be launched. Since the interference of both modes determines the near-field intensity distribution, the plasmonic energy can be guided towards either arm by controlling the relative phase between the two laser pulses.