Berlin 2018 – scientific programme

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O: Fachverband Oberflächenphysik

O 56: Plasmonics and nanooptics: Light-matter interaction, spectroscopy IV

O 56.1: Talk

Wednesday, March 14, 2018, 10:30–10:45, MA 041

Coupling of IR140 dye molecules to a plasmonic two-wire waveguide — •Christian Schörner, Subhasis Adhikari, and Markus Lippitz — University of Bayreuth, Germany

Plasmonic waveguides offer the possibility to guide light with a subwavelength confinement. For thin metal wires it is well established that they support a single fundamental waveguide mode, called TM0 mode. A combination of two such metal wires with a nanoscale gap in between results in two hybridized modes with a symmetric or antisymmetric surface charge distribution. Recent studies have been able to selectively excite these modes and detect them in the far field be means of a mode detector. Here we investigate the coupling of a near-infrared laser dye, IR140, embedded in a photoresist to such multimode plasmonic two-wire transmission lines by spatially resolved photoluminescence spectroscopy. We show that the photoluminescence of the dye molecules acts as a local source that couples simultaneously to the symmetric and antisymmetric plasmonic waveguide mode. Propagation lengths and position dependent incoupling profiles are obtained by spatially resolved excitation. We further investigate the polarization dependency of the outcoupled emission.