Regensburg 2013 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 39: Optical properties

HL 39.9: Talk

Tuesday, March 12, 2013, 12:30–12:45, H13

Giant enhancement of Pentacene (PEN) Raman scattering and fluorescence emission induced by plasmonic properties of gold Fischer patterns — Jan Rogalski, Andreas Kolloch, Paul Leiderer, Katharina Broch, Frank Schreiber, Alfred J. Meixner, and •Dai Zhang — Institute of Physical and Theoretical Chemistry, Uni. Tübingen, Tübingen

Fischer patterns are metallic nanostructures composed of a network of hexagonal aligned triangles. We studied the plasmonic effects of gold Fischer patterns regarding the substrate and its polarization effects via monitoring the photoluminescence (PL) spectral profile and intensity. The excitation of the Fischer patterns shows strong substrate dependence. On silicon substrates, the PL of Fischer patterns is much weaker than on glass substrates. By using a radially or azimuthally polarized laser beam, we selectively excite the center or corner plasmonic modes of the nanotriangles that make up the Fischer patterns. PEN is a commonly studied optoelectronic material which has found wide-spread application in light emitting diodes or solar cell research. Our experiments clearly show a giant enhancement of the Raman scattering and PL signal from PEN deposited on a Fischer pattern surface. A detailed analysis, entailing the enhancement factor and the plasmon-polariton coupling between the Fischer pattern and the PEN thin film will be presented.