Dresden 2011 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 4: Femtosecond Spectroscopy I
MO 4.1: Vortrag
Montag, 14. März 2011, 14:30–14:45, TOE 317
Coherent two-dimensional nanoscopy — Martin Aeschlimann1, •Tobias Brixner2, Alexander Fischer1, Christian Kramer2, Pascal Melchior1, Walter Pfeiffer3, Christian Schneider1, Christian Strüber3, Philip Tuchscherer2, and Dmitri V. Voronine3 — 1Fachbereich Physik and Research Center OPTIMAS, Technische Universität Kaiserslautern, Erwin-Schrödinger-Str. 46, 67663 Kaiserslautern — 2Institut für Physikalische und Theoretische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg — 3Fakultät für Physik, Universität Bielefeld, Universitätsstr. 25, 33615 Bielefeld
We introduce a new spectroscopic method that determines nonlinear quantum-mechanical response functions beyond the optical diffraction limit. While in established coherent two-dimensional (2D) spectroscopy a four-wave-mixing response is measured using three ingoing and one outgoing wave, in 2D nanoscopy we employ four ingoing and no outgoing waves. The final state is detected via photoemission electron microscopy with sub-50 nm spatial resolution. We record 2D nanospectra from an (18 nm)2 detection area and observe local lineshape variations for plasmonic excitations on a corrugated silver surface. Electronic phase memory persists for longer than 150 fs. 2D nanoscopy makes possible the nonlinear spectroscopic investigation of coherences with nanometer spatial resolution. This allows studying a broad range of phenomena not accessible otherwise such as space-time-resolved coupling, transport, and nonlocal correlations.