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O: Fachverband Oberflächenphysik

O 37: Plasmonics and Nanooptics V: Light-Matter Interaction

O 37.4: Vortrag

Dienstag, 21. März 2017, 14:45–15:00, TRE Ma

Non-linear imaging of individual plasmonic nanostructures using phase-shaped femtosecond laser pulses — •Veit Giegold, Richard Ciesielski, Alexander Biewald, Tobia Mancabelli, Alberto Comin, and Achim Hartschuh — Department Chemie and CeNS, LMU Munich, 81377 Munich

We studied the second harmonic (SH) and near-degenerate four-wave (FWM) mixing response of individual plasmonic nanostructures using a confocal femtosecond pulse shaping setup. We find that the two different signals are maximized for different spectral phases of the laser pulse. We attribute this to different phase terms in the second- and third-order susceptibility of the nanostructures, respectively. We show that by using optimized phase profiles, the contrast of confocal SH and FWM images can be manipulated. This phase-enhanced non-linear imaging can provide further insight into properties of plasmonic nanostructures.