Regensburg 2010 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

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

Mittwoch, 24. März 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 Pucci¹ — ¹Kirchhoff-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.