Dresden 2014 – scientific programme

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O: Fachverband Oberflächenphysik

O 37: Posters: Plasmonics, Electronic Structure and Spin-Orbit Interaction, Semiconductor and Insulator Surfaces, Nanostructures

O 37.2: Poster

Tuesday, April 1, 2014, 18:30–22:00, P2

Thermal annealing of gold infrared nanoantennas — •Jochen Vogt¹, Frank Neubrech^{1, 2}, Andrea Toma³, and Annemarie Pucci¹ — ¹Kirchhoff-Institute for Physics, University of Heidelberg, Germany — ²4th Physics Institute and Research Center SCoPE, University of Stuttgart, Germany — ³Italian Institute of Technology (IIT), Genoa, Italy

For the successful fabrication and application of plasmonic nanostructures, such as nanoantennas, proper material quality is indispensable. Often the material quality strongly affects the plasmonic properties of nanoantennas, which are essential for their application, e.g. for surface-enhanced infrared spectroscopy (SEIRS). In this work we demonstrate that thermal annealing can significantly improve the plasmonic properties of low quality polycrystalline nanowires, fabricated with standard electron beam lithography. Up to a certain temperature, thermal annealing leads to clear blue-shifts in resonance frequency accompanied by strong increases in extinction cross section. Beyond this limit, the annealing turns into a destruction of the nanowires due to the Rayleigh instability. In order to monitor the impact of thermal treatment on the morphology and the plasmonic properties, atomic force microscopy and microscopic infrared spectroscopy, respectively, were performed.