Berlin 2008 – wissenschaftliches Programm
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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 63.4: Hauptvortrag (ohne Erstattung)
Donnerstag, 28. Februar 2008, 10:45–11:15, MA 043
Subwavelength control of nano-optical fields probed by non-linear PEEM — Martin Aeschlimann1, •Michael Bauer2, Daniela Bayer1, Tobias Brixner3, F. Javier Garcia de Abajo4, Walter Pfeiffer5, Martin Rohmer1, Christian Spindler6, and Felix Steeb1 — 1FB Physik, TU Kaiserslautern — 2IEAP, Universität Kiel — 3Inst. für Phys. Chemie, Universität Würzburg — 4CSIC, Madrid — 5Fakultät für Physik, Universität Bielefeld — 6FZ Jülich
Theoretically it has been demonstrated that the interaction of polarization-shaped laser pulses with a nanostructure allows the control of the spatial and temporal evolution of an optical near-field [1]. Recently we succeeded in demonstrating this scheme experimentally [2]. Silver nano-particles are illuminated with polarization shaped femtosecond laser pulses. The near-field in the vicinity of these nanostructures is mapped by the two-photon photoemission pattern as recorded using a photoemission electron microscope. We show that the emission pattern depends on the time-dependent polarization state of the laser pulse. Furthermore, the adaptive polarization pulse shaping technique allows optimizing a particular emission pattern with sub-diffraction resolution. The experiments show that the local interference of the optical near-fields generated by the two orthogonal incident polarization components can be utilized to manipulate the local field distribution in space and time.
[1] T. Brixner et al., Phys. Rev. Lett. 95, 093901 (2005). [2] M. Aeschlimann et al., Nature 446, 301 (2007).