Dresden 2014 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 79: Plasmonics and Nanooptics IV

O 79.6: Vortrag

Donnerstag, 3. April 2014, 17:15–17:30, TRE Ma

Plasmon Dynamics in Noble Metal Nanorods with Femtosecond Pulse-Shaping — •Alberto Comin, Richard Ciesielski, Kevin Donkers, Giovanni Piredda, and Achim Hartschuh — Ludwig-Maximilians-Universitaet Muenchen

Plasmonic nanostructures exhibit localized surface plasmon resonances (LSPR) which greatly enhance optical absorption, scattering, and the near-field component of the electric field. LSPR are coherent, broadband and intrinsically ultrafast collective electronic excitations, with a lifetime of 5-15 fs. Here we present a time resolved study on the femtosecond plasmon dynamics of single metallic nano-particles using confocal microscopy. Broadband 10 fs laser pulses were controlled in amplitude and phase using a 4f shaper configuration. For pulse characterization in the focus of a high numerical aperture objective we developed an extension of the method of multiphoton intrapulse interference phase scans (MIIPS), which we called Gated-MIIPS. This technique allowed us to obtain an accurate characterization of the phase profile of the broadband pulses, which was valuable in achieving reliable characterization of plasmonic nanostructures in the femtosecond time range. In this contribution we will briefly discuss the newly developed Gated-MIIPS technique and the first results on the plasmon dynamics of metallic nanostructures.