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O: Fachverband Oberflächenphysik
O 46: Plasmonics and Nanooptics IV: Fabrication and Applications
O 46.6: Talk
Wednesday, March 20, 2024, 11:45–12:00, MA 042
Mie voids for all-optical sizing and counting of microplastics — •Mario Hentschel1, Julian Karst1, Lukas Wesemann2, and Harald Giessen1 — 14th Physics Institute and Research Center SCoPE, University of Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany — 23ARC Centre of Excellence for Transformative Meta-Optical Systems, School of Physics, The University of Melbourne, Victoria 3010, Australia
Manipulating light on the nanoscale has become a central challenge in metadevices, resonant surfaces, nanoscale optical sensors and many more, and it is largely based on resonant light confinement in dispersive and lossy metals and dielectrics. In contrast, Mie void resonances observed in air-filled cavities in dielectric host materials have been shown to resonantly confine light in air, thus circumventing this loss and dispersion. One of the key benefits afforded by the Mie void concept is the full access to the model volume inside the air-filled void. This allows for maximised interaction of the modal intensities with analytes and other systems of interest, consequently allowing to maximise sensitivities. We demonstrate this potential for nanophotonic sensing and show that Mie voids are ideal sensors for the detection and sizing of nano- and micro-sized particles. We utilize Mie voids of different size and depth for the characterization of ensembles of polystyrene beads as model system for micro- and nanoplastic. We demonstrate that our ansatz allows for the all-optical sizing and counting of micro- and nanoplastic samples, thus being of large environmental importance.
Keywords: nanophotonics; Mie voids; nanoplastic; sensing