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O: Fachverband Oberflächenphysik

O 60: Plasmonics and Nanooptics: Fabrication, Characterization and Applications I

O 60.3: Vortrag

Mittwoch, 19. März 2025, 11:00–11:15, H8

Hybrid resonant metasurfaces combining dielectric nanocup metasurfaces and plasmonic networks — Jelena Wohlwend, Anna Hilti, Claudiadele Polinari, Ralph Spolenak, and •Henning Galinski — Laboratory for Nanometallurgy Department of Materials ETH Zurich, 8093 Zurich, Zurich Switzerland

State-of-the-art dielectric metasurfaces commonly consist of geometric primitives, such as cylinders or nanofins, and their integration into hybrid systems is fundamentally limited as confinement of light occurs only in their interior. In this talk, we report on a simple fabrication scheme that unlocks a new degree of freedom in the optical design space, as it enables the design of complex metasurfaces that break the out-of-plane symmetry [1]. We showcase the versatility of this approach on the specific example of nanocup metasurfaces made of amorphous silicon. We outline the extraordinary modal properties of these resonant sub-wavelength structures including confinement of light in air, lattice resonances and optical non-reciprocity. Creating complex hybrid metasurfaces, which combine such ordered silicon nanocups and disordered plasmonic networks [2, 3], we demonstrate that the generation of configurable structural colors can be tailored by the local near-field coupling between the ordered and disordered optical elements.

References: [1] Adv. Optical Mater. 2024, 12, 2401501. [2] Adv. Optical Mater. 2023, 11, 2300568. [3] Nano Letters 2022, 22 (2), 853-859

Keywords: hybrid metasurfaces; plasmonic networks; dielectric metasurfaces; disordered photonics; mode coupling