Dresden 2009 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 54: Nano-optics of metallic and semiconducting nanostructures (experiments II)
O 54.1: Vortrag
Donnerstag, 26. März 2009, 15:00–15:15, SCH A216
Negative-index bi-anisotropic photonic metamaterial by direct laser writing and silver shadow evaporation — •Michael S. Rill1, Christine E. Kriegler1, Michael Thiel1, Georg von Freymann1,2, Stefan Linden1,2, and Martin Wegener1,2 — 1Institut für Angewandte Physik and DFG-Center for Functional Nanostructures (CFN), Universität Karlsruhe (TH), Wolfgang-Gaede-Str. 1, 76131 Karlsruhe — 2Institut für Nanotechnologie, Forschungszentrum Karlsruhe in der Helmholtz-Gemeinschaft, 76021 Karlsruhe, Germany
Metamaterials are artificially fabricated structures composed of sub-wavelength metallic building blocks (“photonic atoms") that show – unlike natural substances – magnetism at optical frequencies [1].
Here, we present a novel blueprint of a negative-index metamaterial [2]. Our structure is realized using 3D direct laser writing, SiO2 atomic layer deposition and silver shadow evaporation. The comparison of measured linear optical spectra with theory shows good agreement and reveals a negative real part of the refractive index n at around 3.85 µm wavelength – despite the fact that the metamaterial structure is bi-anisotropic [3,4] due to the lack of inversion symmetry along its surface normal.
[1] V.M. Shalaev, Nature Photon. 1, 41 (2007).
[2] M.S. Rill et al., Opt. Lett., accepted.
[3] M.S. Rill et al., Nature Mater. 7, 543 (2008).
[4] R. Marques et al., Phys. Rev. B 65, 144440 (2002).