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O: Fachverband Oberflächenphysik

O 63: Symposium: Frontiers of Surface Sensitive Electron Microscopy II (Invited Speakers: Jürgen Kirschner, Liviu Chelaru, Michael Bauer, Claus Schneider)

O 63.2: Hauptvortrag (ohne Erstattung)

Donnerstag, 28. Februar 2008, 10:00–10:30, MA 043

Imaging Surface Plasmon Polaritons: Time-resolved Two-Photon Photoelectron Emission Microscopy — •Liviu I. Chelaru — Institut für Festkörperforschung, Elektronische Eigenschaften, Forschungszentrum Jülich, Germany

Routing and manipulation of light on nanoscale metallic circuits as surface plasmon polaritons (SPPs) is seen today as a way of integrating microscale photonics and nanoscale electronics on the same chip. A fundamental understanding of the interaction between light and metallic nanostructures is an essential prerequisite for the realisation of functional devices based on SPPs. In this presentation I will focus on the excitation and propagation of SPPs in single-crystalline Ag nanostructures of different shapes and sizes that are formed in-situ by self-assembly during deposition on Si surfaces. Imaging of the SPPs is accomplished by time-resolved two-photon photoelectron emission microscopy (TR-2PPEEM). Here the excited SPP wave is visualised as a result of the interference (beat pattern) between the laser pulses and the travelling SPP wave at the sample surface. I will present time-resolved high-resolution images of the propagating SPP waves recorded using a pump-probe setup. The problem of guiding the SPP waves, and the coupling of light into and out of the nanostructures is discussed by comparing nanostructures of different geometry.