Dresden 2009 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 27: Poster Session I (Methods: Scanning probe techniques; Methods: Atomic and electronic structure; Methods: Molecular simulations and statistical mechanics; Oxides and Insulators: Clean surfaces; Oxides and Insulators: Adsorption; Oxides and Insulators: Epitaxy and growth; Semiconductor substrates: Clean surfaces; Semiconductor substrates: Epitaxy and growth; Semiconductor substrates: Adsorption; Nano- optics of metallic and semiconducting nanostructures; Electronic structure; Methods: Electronic structure theory; Methods: other (experimental); Methods: other (theory); Solutions on surfaces; Epitaxial Graphene; Surface oder interface magnetism; Phase transitions; Time-resolved spectroscopies)

O 27.76: Poster

Dienstag, 24. März 2009, 18:30–21:00, P2

Metamaterial Bragg-Stacks — •Ralf Ameling and Harald Giessen — 4th Physics Institute, University of Stuttgart, Germany

Double-fishnet metamaterials consist of two layers of crossed metal wires and can show a negative refractive index for visible or infrared light when the unit cell is smaller than the wavelength of light. We demonstrate coupling of the symmetric and anti-symmetric magnetic resonances of the metamaterial with Bragg-modes in the infrared, where the dielectric space between two double-fishnet meshes forms the Bragg-cavity. The meshes with typical periods of several hundred nanometers are fabricated using electron-beam lithography and a layer-by-layer stacking technique. Experiments and simulations of up to four stacked layers of gold meshes with different distances are performed. The behavior of the resonances (anti-crossing) as well as the influence of structure parameter variations is studied. The resonances are measured using FTIR-spectroscopy.