Dresden 2009 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 27: Poster Session I (Methods: Scanning probe techniques; Methods: Atomic and electronic structure; Methods: Molecular simulations and statistical mechanics; Oxides and Insulators: Clean surfaces; Oxides and Insulators: Adsorption; Oxides and Insulators: Epitaxy and growth; Semiconductor substrates: Clean surfaces; Semiconductor substrates: Epitaxy and growth; Semiconductor substrates: Adsorption; Nano- optics of metallic and semiconducting nanostructures; Electronic structure; Methods: Electronic structure theory; Methods: other (experimental); Methods: other (theory); Solutions on surfaces; Epitaxial Graphene; Surface oder interface magnetism; Phase transitions; Time-resolved spectroscopies)

O 27.74: Poster

Dienstag, 24. März 2009, 18:30–21:00, P2

Time- and energy resolved photoelectron emission microscopy on micro- and nanostructured samples — •Christian Schneider, Martin Rohmer, Daniela Bayer, Pascal Melchior, and Martin Aeschlimann — Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, 67663 Kaiserslautern, Germany

The electronic response on optical excitation of nanostructured samples exhibits fascinating effects, such as subwavelength variations of the field strength and local field enhancements. Combining photoelectron emission microscopy (PEEM) with a femtosecond laser pump-probe-setup enables us to investigate these effects with simultaneous subwavelength spatial and femtosecond temporal resolution. A microscopic understanding of the collective electronic oscillations in nanostructures, like localized surface plasmons (LSPs) or surface plasmon polaritons (SPPs ) is still missing. The technique of time-resolved PEEM gives us the opportunity to direcly measure the transient local near field as well as the electron dynamics of metallic nanostructures. The electron dynamic is strongly energy dependent regarding the excited carriers. Therefore, we upgraded our imaging unit with a ToF energy analyser (delayline-detector). This novel setup allows us to simultaneously acquire data with high spatial resolution in the nanometer regime, femtosecond time resolution and energy resolution. We will show first spectra of well prepared surfaces as well as energy resolved lifetime-maps of micro- and nanostructured samples showing LSP- and SPP-resonances.