Dresden 2006 – wissenschaftliches Programm
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DS: Dünne Schichten
DS 24: Poster presentation
DS 24.14: Poster
Dienstag, 28. März 2006, 15:00–17:30, P2
Infrared spectroscopy of metallic nanostructures — •T. Kolb1, M.E. Toimil-Molares2, T.W. Cornelius2, F. Neubrech1, F. Kost1, S. Karim3, R. Neumann2, A. Pucci1, and G. Fahsold1 — 1Kirchhoff-Institut für Physik, Universität Heidelberg, Im Neuenheimer Feld 227, 69120 Heidelberg — 2Gesellschaft für Schwerionenforschung, Planckstr. 1, 64291 Darmstadt — 3Fachbereich Chemie, Philipps-Universität Marburg, Biegenstr. 10, 35032 Marburg
We investigated the IR-optical properties of single metal nanowires and nanoslits in metal thin films. The wires were prepared by template directed growth of metal in etched ion track polycarbonate membranes. We dispersed these several ten micrometer long wires on IR-transparent substrates. Applying a shadowing technique the dispersed Cu wires were also used as masks for the preparation of nanosized slits in ultrathin Au films. Investigations of broadband IR optical properties of single nanowires and nanoslits were performed by IR spectroscopic microscopy at the synchrotron radiation source ANKA (Forschungszentrum Karlsruhe). Using this contact free measurement technique we can distinguish between a metallic and a non-metallic behaviour of a single nanowire. For quantitative analysis we try to simulate the spectra to determine the value of conductivity. Our results for the corresponding nanoslits with a width of a few hundred nanometers and a length in the ten micrometer range show a transmission which increases with wavenumber and which exceeds the transmission of the continous Au film in the mid-infrared range. We compare this behaviour to calculations of the small-slit transmission coefficient from classical electromagnetic scattering theory.