Dresden 2009 – scientific programme

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O: Fachverband Oberflächenphysik

O 54: Nano-optics of metallic and semiconducting nanostructures (experiments II)

O 54.1: Talk

Thursday, March 26, 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 Freymann^1,2, Stefan Linden^1,2, and Martin Wegener^1,2 — 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).