Regensburg 2019 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 58: Nanostructures, Nanostructuring and Nanosized Soft Matter

CPP 58.1: Hauptvortrag

Donnerstag, 4. April 2019, 15:00–15:30, H13

Gyroids on the nanoscale: Metamaterials with surprising optical properties — •Bodo Wilts — Adolphe Merkle Institute, University of Fribourg, Fribourg, Switzerland

Block copolymers can self-assemble into various nanostructured morphologies, such as lamellae, cylinders, spheres and the gyroid. Such polymeric structures can be used as templates to fabricate functional nanostructured materials. This bottom-up fabrication route allows generating materials with different, or entirely novel, properties. One example are optical metamaterials, metallic structures with unit cells smaller than the wavelength of light. Here, I will show that optical metamaterials can be fabricated by replicating gyroid polymeric nanostructures into plasmonic metals. The cubic gyroid structure is of particular interest for optical metamaterials applications due to its inherent chirality, which promises to induce novel optical properties in gyroid metal replica. I will demonstrate that these gyroids indeed show surprising optical properties such as linear and circular dichroism, and will show that these properties originate from a contribution of the surface morphology and the local orientation of the gyroid structure. I will discuss the importance of structural order of the polymeric templates on the resulting optical metamaterials and will further outline how changing the material composition, e.g. by changing the material from gold to silver, changes the optical properties of the nanostructures.