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O: Fachverband Oberflächenphysik
O 82: Plasmonics and Nanooptics: Fabrication, Characterization and Applications II
O 82.3: Vortrag
Donnerstag, 20. März 2025, 11:00–11:15, H8
Engineered disorder metasurfaces for near-field light shaping — •Luca Schmid1, Julian Schwab1, Chi Li2, Stefan Maier2, Harald Giessen1, Haoran Ren2, and Mario Hentschel1 — 14th Physics Institute and Research Center SCoPE, University of Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany — 2School of Physics and Astronomy, Monash University, Clayton, Victoria, Australia
Plasmonic and dielectric nanophotonic building blocks allow for shaping the flow of light at boundaries and interfaces. They have opened the field of metasurfaces, which until now mostly allow for the creation of nearly arbitrary far-field intensity distributions in the far field. Drawing inspiration from this concept, we introduce metasurfaces for near-field light shaping. Desired near-field intensity distributions can be created by engineering the distribution of individual scatterers on metallic surfaces and hence the interference of the individually launched surface plasmons. Using this ansatz, we demonstrate engineered-disorder metasurfaces which enable to direct, focus, and demultiplex incident light. We implement these structures by a peel-off process from molds, which results in ultra-smooth metallic surfaces, maximizing the plasmon propagation length. Far-field measurements based on a k-space spectroscopy setup allow us to image the local near-field and show excellent agreement with modelling and simulation. We envision that the creation of nearly arbitrary near-field distributions will enable nanoscale routing and sorting of light based on polarization, orbital angular momentum, and wavelength, as well as help realize novel coupling schemes to emitters and nanoscale systems.
Keywords: Metasurfaces; Nanophotonics; Demultiplexing; Disorder; Plasmonics