Dresden 2006 – scientific programme
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MM: Metall- und Materialphysik
MM 29: Poster Session (SYNW)
MM 29.6: Poster
Thursday, March 30, 2006, 10:00–11:00, P4
Resonant metal nanowire excitation in the infrared — •F. Neubrech1, S. Karim2, F. Kost1, T. Kolb1, R. Lovrincic1, R. Neumann2, A. Pucci1, and G. Fahsold1 — 1Kirchhoff-Institut für Physik, Universität Heidelberg, INF 227, 69120 Heidelberg — 2Gesellschaft für Schwerionenforschung, Planckstr. 1, 64291 Darmstadt
We analyse IR spectroscopic properties of single metal nanowires (Cu, Au) and compare the experimental results with simulations of electromagnetic scattering by a perfectly conducting wire. The nanowires with diameters from 50 to 200 nm are prepared by electrochemical deposition in polymeric etched ion track membranes [1]. After dissolution of the membrane, the single wires are put on an IR transparent KBr substrate for spectroscopic measurements, the most of which are performed with the IR microscope at the synchrotron light source ANKA. Spectroscopic microscopy allows to investigate single nanowires of a well defined length, volume, and orientation. We measured the IR transmission in the range from 700 cm-1 to 7000 cm-1 on nanowires with different diameters and lengths. For few micrometer long nanowires we see antenna-like resonances that depend on size and shape of the wires are in good agreement with our calculations. [2]
Due to an antenna-like resonance the enhancement of the electromagnetic nearfield is expected. For an experimental proof, we evaporate a thin paraffin layer on and around the wire and analyse the enhancement of vibration lines.
[1] M.E. Toimil Molares et al., Nanotechnology 15 (2004), 201
[2] G. Fahsold et al., ANKA annual report (2004).