Dresden 2017 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 59: Plasmonics and Nanooptics
O 59.23: Poster
Dienstag, 21. März 2017, 18:30–20:30, P2-OG1
Polymer Orientation Sensitive Scanning Near-field Optical Microscopy — •Jinxin Zhan1, Jens Brauer1, Daniel Trefz2, Sabine Ludwigs2, Petra Groß1, and Christoph Lienau1 — 1Carl von Ossietzky Universität, Oldenburg, Germany — 2Institut für Polymerchemie, Stuttgart, Germany
Well aligned polymer fibers attract wide interest in film transistor, solar cell, and display applications etc. due to their excellent optical-to-electric transfer efficiency and their charge transport characteristics. Their latter performance is greatly influenced by the alignment of polymer chains on a nano- to microscopic scale. Hence, in order to study the relationship between their structure and propertity, especially the local fluctuations below the domain size of typically a few ten nanometers, an optical imaging method sensitive to polymer orientation with nanometer resolution is required. Here we use a Scanning Near-field Optical Microscope (SNOM) based on a backscattering geometry to investigate fiber alignment in a polymer P(NDI2OD-T2) film. Spectral absorption measurements reveal an optimum optical contrast of the polymer film near the resonance wavelength of P(NDI2OD-T2). Changing the polarization direction of the linearly polarized excitation laser enables us to determine the molecular orientation with a resolution of about 10 nm. Extracting the polymer orientation from the SNOM optical signal is facilitated by adapting a well-established model that describes the tip as a dipole.[1]