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O: Fachverband Oberflächenphysik
O 43: Plasmonics and Nanooptics III: Periodic Structures and Theory
O 43.5: Vortrag
Dienstag, 17. März 2020, 11:30–11:45, WIL A317
Generalized 1D description of light coupling to arbitrarily curved plasmonic wires — •Thorsten Feichtner1, Katja Höflich2, Jer-Shing Huang3, and Bert Hecht1 — 1Nano-Optics & Biophotonics Group, Wilhelm-Conrad-Röntgen-Center for Complex Material Systems (RCCM), Experimental physics 5 - Universität Würzburg, Germany — 2Max Planck Institute for the Science of Light, Erlangen, Germany — 3Leibniz Institute of Photonic Technology, Albert-Einstein Strasse 9, Jena D-07745, Germany
Plasmons propagating on metallic nano wires (MNWs) with spherical cross sections are fully understood and analytical solutions for the decomposition of the fields in Mie modes exist. We have already shown that for helically curved wires, so-called plasmonic helices, also an analytical one-dimensional model can be used to calculate their coupling to circular polarized planar wave far-field excitation [1].
Here we first extend this model to also describe coupling of helices to point dipoles. This is done to explain the results from [2] which shows strongly directed emission. We also extend the model to more arbitrary curved wires to explain the near-field behavior of 3D Archimedian spirals as introduced in [3]. This powerful tool will allow the fast development of plasmonic wire geometries for tailored near-fields or far-field scattering.
[1] Hoeflich, Katja, et al., Optica 6.9 (2019): 1098-1105.
[2] Wang, Mengjia, et al., Light: Science & Applications 8.1 (2019): 1-8.
[3] Tseng, Ming Lun, et al., Adv. Opt. Mat. (2019): 1900617.