Regensburg 2010 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 59: Poster Session II (Nanostructures at surfaces: Dots, particles, clusters; Nanostructures at surfaces: arrays; Nanostructures at surfaces: Wires, tubes; Nanostructures at surfaces: Other; Plasmonics and nanooptics; Metal substrates: Epitaxy and growth; Metal substrates: Solid-liquid interfaces; Metal substrates: Adsoprtion of organic / bio molecules; Metal substrates: Adsoprtion of inorganic molecules; Metal substrates: Adsoprtion of O and/or H; Metal substrates: Clean surfaces; Density functional theory and beyond for real materials)

O 59.31: Poster

Mittwoch, 24. März 2010, 17:45–20:30, Poster B1

Near-field phase and flux controllability in the near-field — •Giovanni Piredda, Caroline Gollub, Regina de Vivie-Riedle, and Achim Hartschuh — Physikalische Chemie, Department Chemie und Biochemie, Ludwig-Maximilians-Universität München

Ultrafast nanooptics is an emerging field that combines the concepts and tools of ultrafast spectroscopy with those of near-field optics [1]. A basic form of coherent control in the near-field is the ability to concentrate the linear optical flux at a desired location with sub-diffraction resolution. This task requires polarization pulse shaping of the incident electric field [2]. We show, using simple examples, that the presence of quick spatial variations of the phase (“near-field phase”) is an essential ingredient for the controllability of linear flux in the near-field. The near-field phase, that does not depend on propagation, is almost always present when light interacts with a nanostructure [3]. We analyze a nanoparticle and incident field configuration in which near-field spatial variations of the phase are almost completely absent to highlight the fact that without them control of flux localization cannot succeed. In addition we present our first results of control of second-harmonic generation from rough gold films in a near-field optical setup.

[1] M.I. Stockman et al., Phys. Rev. Lett., 88, 067402 (2002).

[2] T. Brixner et al., Phys. Rev. B, 73, 125437 (2006).

[3] R. Carminati, Phys. Rev. E 55, R4901 (1997).