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Q: Fachverband Quantenoptik und Photonik

Q 45: Plasmonics and Metasurfaces

Q 45.2: Talk

Thursday, March 5, 2026, 11:30–11:45, P 3

UV-Compatible Mie Void Metasurfaces — •Serkan Arslan, Julian Schwab, Harald Giessen, and Mario Hentschel — University of Stuttgart, 4th Physics Institute

In recent years, metasurface design has increasingly shifted toward dielectric platforms rather than plasmonic systems. While plasmonic resonances are limited by intrinsic ohmic losses in metal nanostructures, high-refractive-index dielectrics support low-loss Mie resonances in the infrared and visible spectral ranges. However, this advantage diminishes in the ultraviolet (UV), where nearly all dielectric materials become highly absorptive at sufficiently high photon energies. Consequently, UV metasurface research has largely focused on identifying wide-bandgap materials with minimal absorption.

Here, we take a different approach based on Mie void resonances, which have emerged as a complementary concept in dielectric nanophotonics. By confining light in air within a high-refractive-index host, Mie voids circumvent material losses and enable dispersion-free resonance tuning extending into the UV.

We introduce polarization-dependent elliptical Mie voids and investigate their polarization-resolved resonances and mode formation. Exploiting this polarization degree of freedom, we fabricate Pancharatnam-Berry (PB) phase metasurfaces on GaAs substrates. These metasurfaces demonstrate 90° off-axis reflective focusing in the visible range with numerical apertures up to 0.25, as well as orbital angular momentum (OAM) generation.

Keywords: Metasurface; PB Phase; Mie Void; UV