Dresden 2011 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 66: Plasmonics and Nanooptics VI
O 66.4: Vortrag
Donnerstag, 17. März 2011, 12:00–12:15, WIL A317
Nanooptical control of hot-spot field superenhancement and long-lived coherences on a corrugated silver surface — Martin Aeschlimann1, Tobias Brixner2, Stefan Cunovic3, Alexander Fischer1, Christian Kramer2, Pascal Melchior1, Walter Pfeiffer3, Christian Schneider1, •Christian Strüber3, Philip Tuchscherer2, and Dmitri V. Voronine3,4 — 1TU Kaiserslautern, Germany — 2Universität Würzburg, Germany — 3Universität Bielefeld, Germany — 4Texas A&M University, College Station, USA
Hot-spots on deterministically or randomly structured metal surfaces enable ultra-sensitive optical spectroscopy by increasing the optical signals. For example, Raman signals from molecules placed on Ag surfaces may be enhanced dramatically and single molecule sensitivity is reached. Here we combine photoemission photoelectron microscopy (PEEM) and polarization pulse shaping to investigate the multiphoton photoemission from hot-spots on a corrugated silver surface. The hot-spot related multiphoton photoemission is enhanced and manipulated with high contrast. Adaptive optimization reproducibly yield long complex pulse shapes for various optimization goals. This and results from pre-determined few-parameter control scans indicate the presence of long-lived coherences. The existence of such resonances with coherence lifetimes in the order of 100fs is proven in time-resolved local coherent spectroscopy. The high resolution of PEEM allows spatial mapping of these resonances across the surface. Spectral correlations between neighboring hot-spots indicate that weakly localized plasmon polariton states are responsible for the hot-spot emission.