Regensburg 2007 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 13: Symposium: Ultrafast Nanooptics II
O 13.7: Vortrag
Montag, 26. März 2007, 17:00–17:15, H38
Adaptive sub-wavelength control of nano-optical fields — Martin Aeschlimann1, Michael Bauer2, Daniela Bayer1, •Tobias Brixner3, F. Javier García de Abajo4, Walter Pfeiffer5, Martin Rohmer1, Christian Spindler3, and Felix Steeb1 — 1Fachbereich Physik, Technische Universität Kaiserslautern, Erwin-Schrödinger-Str. 46, 67663 Kaiserslautern, Germany — 2Institut für Experimentelle und Angewandte Physik, Universität Kiel, Leibnizstr. 19, 24118 Kiel, Germany — 3Physikalisches Institut, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany — 4Instituto de Optica, Serrano 121, 28006 Madrid, Spain — 5Fakultät für Physik, Universität Bielefeld, Universitätsstr. 25, 33516 Bielefeld, Germany
We combine two previously separated research fields, adaptive quantum control and nano-optics, to achieve dynamic localization of electromagnetic intensity at sub-wavelength nanoscopic spatial resolution. This is demonstrated experimentally with femtosecond polarization shaping and photoemission electron microscopy (PEEM). The electric near field in the vicinity of Ag nanostructures is controlled by employing femtosecond laser pulses with specifically modulated vectorial properties. Two-photon PEEM probes the lateral intensity distribution, and a learning algorithm optimizes the external field such that photoemission is localized in the desired places. Thus pulse shaping and quantum-control concepts are now also available with nanoscale resolution.