Berlin 2024 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 46: Plasmonics and Nanooptics IV: Fabrication and Applications

O 46.7: Vortrag

Mittwoch, 20. März 2024, 12:00–12:15, MA 042

High-refractive Index Nanodisk Arrays with Hyperuniform Disorder — •Davy Tesch, Koundinya Upadhyayula, Bodo Fuhrmann, Alexander Sprafke, and Ralf Wehrspohn — Martin Luther University Halle-Wittenberg, 06120 Halle, Germany

Light-scattering metasurfaces with tailored disorder, especially Hyperuniform disorder (HuD), have recently garnered interest within the photonics community. HuD promises various properties that, until now, have only been associated with either periodic or random structures. The combination of strong diffraction from periodic structures and the spectrally broadband response of disordered structures holds promise for light scattering.

In this work, we experimentally investigate HuD nanodisk arrays made of amorphous silicon (a-Si). The high refractive index of a-Si enables the excitation of pronounced Mie resonances in the nanodisks. However, the optical response of the nanodisk array is significantly impacted by the arrangement of the nanodisks, namely the structure factor. The interaction between the form factor and HuD structure factor is central to our investigations. We employ a scalable fabrication process to experimentally prepare HuD nanodisk arrays using a-Si optimized for low absorption as the nanodisk material. Our results indicate a substantial impact of HuD on the optical response of the system. Furthermore, we also examine more complex systems, such as HuD nanodisk arrays at a defined distance above metallic mirrors.

Keywords: hyperuniformity; metasurfaces; nanophotonics; tailored disorder; Mie resonators