Negative-index bianisotropic photonic metamaterial fabricated by direct laser writing and silver shadow evaporation.
We present the blueprint for a novel negative-index metamaterial. This structure is fabricated via three-dimensional two-photon direct laser writing 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 at around 3.85 microm wavelength -- despite the fact that the metamaterial structure is bianisotropic owing to the lack of inversion symmetry along its surface normal.
Rill
Michael S
MS
Institut für Angewandte Physik and DFG-Center for Functional Nanostructures (CFN), Universität Karlsruhe (TH), Karlsruhe, Germany. michael.rill@physik.uni-karlsruhe.de
Kriegler
Christine E
CE
Thiel
Michael
M
von Freymann
Georg
G
Linden
Stefan
S
Wegener
Martin
M