Dresden 2020 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 18: Poster Session I

MM 18.26: Poster

Monday, March 16, 2020, 18:15–20:00, P4

Towards all-optical spectroscopy of ordered and disordered phononic crystals — •Tobias Claus, Sina Ludewig, and Henning Ulrichs — I. Physikalisches Institut, Georg-August-Universität Göttingen, Göttingen, Germany

On this poster we report on our recent progress regarding the conceptual realization, fabrication and optical spectroscopy of disordered and ordered phononic metamaterials. Besides applications in acoustics and heat conduction, such materials can generally be used as macro- to nanoscale toy models for physical phenomena based on wave interference. Note that topological spectral properties are nowadays of great scientific interest mainly regarding electronic structure. But also bosonic excitations like magnons and the here addressed phonons can acquire unconventional properties like localization due to symmetry breaking [1] or due to disorder-induced omnidirectional band gaps. [2] Here, we present our design strategy for metamaterials targeting elastic dynamics from the MHz to GHz spectral range. This strategy is based on FEM modelling of the sample and of the finally envisaged all-optical pump-probe experiment. Secondly, we discuss our experimental setup and first measurements on a sample structured by the focussed ion beam experimental technique. We acknowledge financial support by the DFG within the SFB 1073.