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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 10: Bioinspired Functional Materials II
CPP 10.8: Vortrag
Montag, 20. März 2017, 17:00–17:15, ZEU 114
Gyroid Optical Metamaterials: Termination-Induced Anisotropy — •Matthias Saba1, James A. Dolan2,4, Raphael Dehmel2, Angela Demetriadou1, Ilja Gunkel5, Yibei Gu3, Ulrich Wiesner3, Timothy D. Wilkinson4, Ullrich Steiner5, Jeremy J. Baumberg2, Bodo D. Wilts5, and Ortwin Hess1 — 1Department of Physics, Imperial College, Prince Consort Road, London SW7 2BB, UK — 2Department of Physics, University of Cambridge, J.J. Thomson Avenue, Cambridge CB3 0HE, UK — 3Department of Materials Science and Engineering, Cornell University, 214 Bard Hall, Ithace, NY 14853-1501, USA — 4Department of Engineering, University of Cambridge, J.J. Thomson Avenue, Cambridge CB3 0HE, UK — 5Adolphe Merkle Institute, Ch. des Verdiers 4, 1700 Fribourg, Switzerland
Inspired by gyroid photonic crystals that are found in the wing-scales of several butterfly species, metallic gyroids fabricated via self-assembly constitute the first example of a truly three dimensional optical metamaterial. Gyroid metamaterials (GMMs) are known for their unique optical properties, such as linear and circular dichroism.
We here demonstrate experimentally and theoretically that (a) short range order GMMs essentially behave similar to isotropic nanoporous gold and can effectively be modeled by a Bruggeman approach, and that (b) the strong linear dichroism observed for long range order GMMs stems from a distinct plasmonic response at the GMM surface that breaks the cubic symmetry of the gyroid and is extremely sensitive to the specific surface termination.