Dresden 2009 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 35: Postersession Transport: Nanoelectronics, Quantum Coherence and Quantum Information, Fluctuations and Noise

TT 35.24: Poster

Mittwoch, 25. März 2009, 14:00–18:00, P1A

Optical Spectroscopy on Tuneable Nano Gaps — •Daniel Gerster¹, Joachim Reichert¹, Stefan Klein², Harald Fuchs², and Johannes V. Barth¹ — ¹Physik Department, TU München, Germany — ²Physikalisches Institut, Universität Münster, Germany

Novel techniques to establish tuneable nano gaps designed to act as electrodes for single molecule charge transport measurements are required both for fundamental research and device oriented applications. Hereby, the implementation of additional control parameters to influence the properties of the functional molecule within the gap is of special interest. We present a method to fabricate tuneable nanoscale electrodes where an apertureless scanning nearfield tip (SNOM-tip) is employed to serve as a counter electrode in a molecular junction and simultaneously as a light source. The apertureless SNOM-tip acts as plasmonic waveguide to focus surface plasmon polaritons to the apex of the tip, where a strongly enhanced evanescent field is confined to only a few nanometers. First spectroscopic measurements of light absorption at the empty gap reveal distinct standing wave patterns of optical waves between the electrodes, indicating high field intensities in the gap region.