Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 56: Plasmonics and nanooptics: Light-matter interaction, spectroscopy IV
O 56.5: Vortrag
Mittwoch, 14. März 2018, 11:30–11:45, MA 041
Limits of Babinet principle for plasmonic antennas — •Vlastimil Křápek1, Michal Horák1, Martin Hrtoň1, Andrea Konečná2, Filip Ligmajer1, Michael Stöger-Pollach3, and Tomáš Šikola2 — 1CEITEC, Brno University of Technology, Purkyňova 123, CZ-61200 Brno, Czech Republic — 2CIC nanoGUNE, Tolosa Hiribidea 76, E-20018 Donostia – San Sebastián, Spain — 3USTEM, TU Vienna, Wiedner Hauptstr. 8-10, A-1040 Wien, Austria
Babinet principle relates the properties of a planar plasmonic antenna (particle) and a complemetary aperture in a thin metal film of the same size and shape. In particular, the energies of localized surface plasmon (LSP) resonances in both antennas shall be identical and the corresponding near fields shall be complementary with the electric-field distribution of the solid antenna corresponding to the magnetic-field distribution of the complementary aperture.
We investigate the limits of the Babinet principle for gold plasmonic antennas (discs and disc-shaped apertures) using electron energy loss spectroscopy, cathodoluminescence, and theoretical modeling. We show that Babinet priciple qualitatively holds but quantitative differences are found. The energies of LSP resonances in apertures are red-shifted and the near fields are less localized. Plasmonic breathing mode is observed only for particles. Observed response of apertures is stronger than that of particles, which is attributed to better heat drain and sharper edges of apertures. Finally, we discuss the possibility to employ Babinet principle for a design of electric and magnetic hot spots.