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O: Fachverband Oberflächenphysik

O 75: Plasmonics and Nanooptics

O 75.4: Poster

Mittwoch, 18. März 2015, 18:15–21:00, Poster A

Tuning the Localized Surface Plasmon Resonance: An Annealing Study for Aluminium, Copper, Gold and Silver Nanostructures Prepared by Nanosphere Lithography — •Stefan Moras, Jacek Gasiorowski, Ovidiu D. Gordan, and Dietrich R. T. Zahn — Semiconductor Physics, Technische Universität Chemnitz, D-09107 Chemnitz

Metallic nanostructures attract great interest due to their unusual characteristics. The optical response of such nanostructures differs markedly from bulk material because of the localized surface plasmon resonance (LSPR) of these structures. Optical properties associated with LSPR are determined by shape, size, structure, and the local dielectric environment of the metal nanostructures. Here we present a detailed characterization of the tunability of the LSPR in aluminium, copper, gold, and silver nanostructures by annealing up to 500 °C in nitrogen atmosphere. All structures were prepared by nanosphere lithography (NSL) where self-assembled monolayer of polystyrene particles served as a mask for metal evaporation. UV-vis spectroscopy was used to determine the LSPR of these structures. Changes in morphology were investigated using scanning electron microscope (SEM). Gold and especially silver show pronounced tunability in the visible region due to their change of shape from triangular towards spherical. Copper shows a difference in LSPR which we attribute to a different type of surface oxide whereas aluminium shows no tunability in the temperature range used due to the capping by an aluminium oxide layer.