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Dresden 2011 – scientific programme

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DS: Fachverband Dünne Schichten

DS 37: Plasmonics and Nanophotonics O-IV (jointly with HL and O)

DS 37.6: Talk

Wednesday, March 16, 2011, 12:30–12:45, WIL A317

Spatiotemporal nanofocusing in random nanostructures achieved by time-reversal, adaptive optimization, and optimal open-loop control of ultrashort laser pulses — •Dominik Differt1, Javier Garcia de Abajo2, Christian Strüber1, Dmitri Voronine1,3, and Walter Pfeiffer11Fakultät für Physik, Universität Bielefeld, Universitätsstr. 25, 33615 Bielefeld, Germany — 2Instituto de Optica, CSIC, Serrano 121, 28006 Madrid, Spain — 3Department of Physics, Texas A&M University, 4242 TAMU, College Station, USA

Because of the reciprocity of electromagnetic wave propagation the time-reversal of a wave emitted from a nanoemitter embedded in a random scattering environment should refocus in space and time at the emitter site. If only partial waves, e.g. one particular planar wave component, of the outgoing wave are time-reversed this nanolocalization of the back-propagated wave is not perfect. Here we investigate the degree of spatiotemporal nanolocalization of time-reversed partial planar waves. The chosen nanostructure consists of two nanoemitter particles embedded in a random assembly of metallic nanospheres acting as scattering environment. A multiple elastic scattering of multipole expansion (MESME) code is used for solving Maxwell's equations in frequency domain. The degree of nanolocalization varies significantly and depends critically on which partial planar wave is time-reversed. In addition, direct adaptive optimization or optimal open-loop control of the spatiotemporal nanofocusing of planar waves at the emitter position exhibits a much higher degree of nanolocalization.

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