Dresden 2020 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 83: Poster Session - Plasmonics and Nanooptics: Light-Matter Interaction, Spectroscopy

O 83.10: Poster

Mittwoch, 18. März 2020, 18:15–20:00, P2/EG

Towards Plasmonic Transistors - Plasmon damping on J-aggregated Squaraine dye coated gold films — •Christoph Bennenhei1, Moritz Gittinger1, Sven Stephan1, Jennifer Zablicki2, Arne Lützen2, Manuela Schiek1, Christoph Lienau1, and Martin Silies11Carl von Ossietzky Universität Oldenburg — 2Rheinische Friedrich-Wilhelms-Universität Bonn

Surface plasmon polaritons (SPPs) generated in metallic waveguides provide the possibility to manipulate light below the diffraction limit and are hence a first building block towards all-optical switching on the nanoscale. For ultrafast all-optical switching, coupling of the SPP modes to highly nonlinear excitonic materials [1] is necessary. We present J-aggregated squaraine dye (SQ) thin films as a promising candidate, since it shows a broad spectral resonance tunable by a thermal annealing process [2]. Here, we investigate power-dependent photobleaching of 10nm spin-coated ProSQ-C16 films in a confocal reflection spectroscopy setup, in a second step, we study the damping of the SPP modes propagating along the metal-SQ film interface by measuring the amount of light that outcoupled from pairs of grating couplers with varying distances. We find a significantly reduced decay length of the SPP for the SQ-metal interface around the excitonic resonance compared to an air-metal interface. High oscillator strength and photo-stability of SQ motivate future investigations of both optical pumping to invert damping rates as well as coherent energy transfer between SQ and SPPs. [1] P. Vasa, et al., Nature Photonics, 7 (2), pp 128-132 (2013) [2] M. Schulz, et al, Nat Commun 9, 2413 (2018)

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