Regensburg 2016 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 42: Plasmonics and Nanooptics III: Infrared Microscopy
O 42.6: Vortrag
Dienstag, 8. März 2016, 15:15–15:30, H4
Surface-enhanced infrared chemical imaging — •Frank Neubrech1, Lucca Kühner1, Mario Hentschel1, Ute Zschieschang2, Hagen Klauk2, and Harald Giessen1 — 14. Physics Institute and Research Center SCoPE, University Stuttgart, Stuttgart — 2Max Planck Institute for Solid State Research, Stuttgart
Infrared (IR) chemical imaging provides laterally resolved spectroscopic information of molecular species based on their material-specific vibrational bands. Nowadays, this powerful method is applied in medicine and pharmacy to identify different drugs or to differentiate between healthy and diseased tissues. However, the method suffers from the relatively low excitation cross-sections of the IR vibrations. To overcome this limitation, we combine surface-enhanced infrared spectroscopy (SEIRA), which enables the detection of minute amounts of molecules down to attomolar concentrations, and chemical imaging to map heterogeneous molecular layers of nanometer thickness. More specifically, we evaporated 30 nm thick areas of pentacene as well as C60 using shadow mask lithography on highly homogeneous nanoantenna arrays fabricated by electron beam lithography. The acquired chemical maps demonstrate a significantly improved detection limit in comparison to conventional chemical imaging.