Berlin 2018 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 39: Focus Session: Phonon Polaritons: Opportunities for THz Nanooptics II
O 39.3: Vortrag
Dienstag, 13. März 2018, 14:30–14:45, HE 101
Surface-Enhanced Terahertz Spectroscopy of Organic Molecules — •Lucca Kühner1, Weiwu Li2, Frank Neubrech1,3, Martin Dressel2, and Harald Giessen1 — 14th Physics Institute, University of Stuttgart — 21st Physics Institute, University of Stuttgart — 3Kirchhoff-Institute for Physics, University Heidelberg
Mid-infrared (MIR) spectroscopy allows for label-free identification of chemical species by their characteristic intramolecular vibrations and is thus widely used in biology, pharmacy, and medical sciences. For isomeric molecules, e.g., monosaccharides such as glucose and fructose which have the same chemical bonds and similar spatial arrangement, vibrational bands in the MIR region do mostly not provide sufficient specific information. In contrast, terahertz (THz) spectroscopy probes intermolecular interactions in mostly crystalline structures and is thus sensitive to the molecule's conformation. This technique is consequently able to differentiate between isomeric molecules. However, the absorption cross-section of such intermolecular interactions is even lower than for MIR spectroscopy. To overcome this limitation, we are going to extend the concept of surface-enhanced infrared spectroscopy (SEIRS) to the THz wavelength range. In this work, we demonstrate measurements of two crystalline configurations of Glucose in the THz region. By introducing surface-enhanced THz spectroscopy we aim at improved sensitivity.