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DPG

Regensburg 2010 – scientific programme

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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 59.33: Poster

Wednesday, March 24, 2010, 17:45–20:30, Poster B1

Temperature dependence of antenna-like plasmon resonances of gold nanowires in the Infrared — •Jörg Bochterle1, Frank Neubrech1, Hoang Vu Chung1, Dominik Enders2, Tadaaki Nagao2, and Annemarie Pucci11Kirchhoff-Institute for Physics, Heidelberg University, Germany — 2National Institute for Material Science, Tsukuba, Japan

Quantitative knowledge about conductivity parameters in metal nanostructures is of high practical interest in nanotechnology. Since contacts for direct current measurements mostly are problematic, contact-free spectroscopic measurements would be preferable. In fact, plasmonic resonance spectra are determined by the conductivity parameters. Unfortunately, except few special cases, the relation between metal conductivity and plasmonic particle resonance is complicated and it is important to get systematic experimental data.

We therefore study infrared plasmonic excitation of lithographic gold nanowires at various temperatures between 30 K and 600 K. The experiments were performed under UHV conditions to realize LHe cooling down to 30 K without formation of thick adsorbate layers. Electron impact heating was used to control the amount of energy transferred to the sample holder, thus being able to approach various temperatures in the desired range. With decreasing temperature a decreasing number of phonons in the gold nanowires is expected and therefore a lower relaxation rate of conducting electrons and accordingly a change in the plasmonic resonance curve.

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