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O: Fachverband Oberflächenphysik

O 60: Poster Session IV (Solid/liquid interfaces; Semiconductors; Oxides and insulators; Graphene; Plasmonics and nanooptics; Electronic Structure; Surface chemical reactions; Heterogeneous catalysis)

O 60.81: Poster

Wednesday, March 16, 2011, 17:30–21:00, P4

Imprinting the optical near field of single and monolayered micro spheres into phase-change films — •Paul Kühler¹, Jan Siegel², Javier García de Abajo², Andreas Kolloch¹, Philipp Leiprecht¹, Johannes Boneberg¹, and Paul Leiderer¹ — ¹Fachbereich Physik, Universität Konstanz — ²Instituto de Optica, CSIC, Madrid

Control over the optical near-field is a crucial prerequisite for several applications of light at the nanoscale, such as material processing, microscopy and biosensing. We present a method that allows for directly imaging the near-field distribution of nanostructures. Our test systems were scattering dielectric micro spheres on a planar substrate. Irradiation with short, infrared laser pulses were performed on particles on a thin, chalcogenide film, which is modified depending on the local fluence and therefore records the scattering field distribution. Single particles as well as monolayers of these particles were used as target. Investigating the single particle patterns with optical microscopy, we demonstrate the influence of polarization and angle of incidence of the incident beam as well as the particle size on the imprints. Due to the monotonicity over a large fluence range of the chalcogenide film's response to irradiation, the experimental results could be shown to be in quantitative agreement with a model based on a rigorous solution of Maxwell's equations. In case of monolayers, high-resolution scanning electron measurements reveal modifications in the chalcogenide film with lateral dimensions down to 1/16 of the irradiation wavelength.