Berlin 2024 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 14: Plasmonics and Nanooptics II: Light-Matter Interaction and Spectroscopy

O 14.9: Vortrag

Montag, 18. März 2024, 17:15–17:30, MA 042

Mie Void Metasurfaces — •Michelle Pfahl, Benjamin Reichel, Serkan Arslan, Mario Hentschel, and Harald Giessen — 4th Physics Institute and Research Center SCoPE, University of Stuttgart, Pfaffenwaldring 57, 70569, Stuttgart, Germany

The field of nanooptics has developed into a subject of large interest as it addresses the manipulation of light on this microscopically small scale. Metasurfaces, which are based on the interaction of optical resonators with light, offer novel possibilities for compact optics replacing conventional optical devices as well as offering novel functionalities. Dielectric Mie voids have emerged as a new building block for these metasurfaces. Spherical air inclusions in high index materials allow to resonantly confine light, circumventing material loss. Thus, these structures show pronounced resonances even in the UV spectral range. We take the first step to implement Mie void based metasurfaces by realizing a blazed grating. Using microspectroscopy in the real as in the spatial Fourier domain, as well as carrying out diffraction experiments with monochromatic light, we confirm the asymmetric diffraction behavior of our gratings. Furthermore, we implemented an analytical model which reproduces our results well. Mie voids promise further interesting applications for metasurfaces, such as reflective lenses, which could even work in the deep UV spectral range.

Keywords: nanooptics; optical resonator; metasurface; Mie void; spectroscopy