Dresden 2017 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 27: Photoswitchable Materials

CPP 27.4: Vortrag

Dienstag, 21. März 2017, 14:45–15:00, ZEU 114

Near field induced structuring of photosensitive polymer films: SNOM and AFM measurements — •Joachim Jelken, Burkhard Stiller, Carsten Henkel, Svetlana Santer, and Dieter Neher — Institute of Physics and Astronomy, University of Potsdam, Potsdam, Germany

Here we report on structuring of photosensitive polymer films by near field intensity pattern. The near fields were generated at a nano-groove fabricated within a thin metal layer. It is well known that when the nano-groove is irradiated, a surface plasmon wave is generated within the nano-groove, that should propagate along the metal surface. We have found, that instead of propagating SP mode, a standing EM-wave is generated at the metal/dielectric interface as a result of constructive interference between propagating SP mode and transmitted light. We have analyzed this phenomenon using photosensitive azobenzene containing polymer film placed above the metal surface [1-3]. The polymer film deforms following the intensity distribution of light only in case of stationary distribution of the intensity or polarization pattern. We have analyzed the system theoretically and have found that the standing wave exist even in the absence of the polymer film. This was also supported by SNOM measurements [4]. [1] T. Papke, N. Sekhar Yadavalli, C. Henkel, and S. Santer, ACS Appl. Mater. Interfaces, 6 (2014) 14174. [2] König, T.; Tsukruk V. V.; Santer, S., ACS Appl. Mater. Interfaces, 5 (2013) 6009. [3] König, T.; Yadavalli, N. S.; Santer, S., Plasmonics 7, (2012) 535. [4] J. Jelken, diploma thesis 2015.