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 37.42: Poster

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

Tuning the Localized Surface Plasmon Resonance in Silver Nanostructures prepared by Nanosphere Lithography — •Stefan Moras, Ovidiu D. Gordan, and Dietrich R. T. Zahn — Semiconductor Physics, Technische Universität Chemnitz, D-09107 Chemnitz

Metallic nanoparticles and regular nanostructures attract great interest because of their unusual properties. The outstanding optical response of such structures stems from the Localized Surface Plasmon Resonance (LSPR) produced by oscillations of the electronic charge density under electromagnetic radiation. Recent advancements in producing ordered metallic objects at nanoscales enabled the use of LSPRs for light manipulation and made them a valuable tool for chemical and biological sensing experiments. Optical properties associated with LSPRs are determined by shape, size, structure, and local dielectric environment. In the present work we study the possibility to tune the LSPRs by changing the size and shape of ordered silver nanostructures. These structures were produced by nanosphere lithography. A close-packed monolayer of polystyrene nanospheres self-assembled at the air-water interface is transferred to arbitrary substrates like glass or silicon. After silver deposition and nanosphere removal only regular silver nanotriangles remain on the substrate. UV-Vis spectroscopy was used to determine the LSPR of these nanostructures on glass substrates. While nanostructures with a high aspect ratio lead to a blue shift with respect to the LSPR of lower aspect ratio structures such a blue shift can also be obtained by annealing.