Regensburg 2019 – scientific programme

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DS: Fachverband Dünne Schichten

DS 14: Poster

DS 14.38: Poster

Tuesday, April 2, 2019, 17:00–20:00, Poster E

Active optical metasurfaces based on defect engineered phase-change and phase-transition materials — Jura Rensberg, Martin Hafermann, •Kevin Wolf, and Carsten Ronning — Institute of Solid State Physics, Friedrich Schiller University Jena, Germany

Energetic ion beams are widely used to modify the electronic and structural properties of solids by introducing impurity atoms into the crystal lattice. Commonly, the inevitable formation of irradiation damage during ion bombardment is described as disadvantageously for ion beam doping and subsequent post-implantation annealing procedures are required. Since the electronic structure of both, phase-change materials, such as chalcogenide glasses, and phase-transition materials, such as vanadium dioxide, are very sensitive to small amounts of lattice defects, area selective ion irradiation can be used to locally adjust either the phase and/or the phase transition temperature of these materials. Using this robust technique, optical metasurfaces including tunable absorbers based on thermally triggered dichroism and reconfigurable polarizers based on artificially induced phase coexistence are demonstrated.