Regensburg 2016 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 52: Photonics and Nanooptics II: Nonlinear Response
O 52.2: Vortrag
Mittwoch, 9. März 2016, 10:45–11:00, S051
Investigation of Plasmonic Modes of Gold Tapers — •Surong Guo1, Nahid Talebi1, Wilfried Sigle1, Christian Knipl1, Martin Esmann2, Simon Becker2, Ralf Vogelgesang2, Christoph Lienau2, and Peter van Aken1 — 1Max Planck Institute for Solid State Research , Heisenbergstraße 1, D-70569 Stuttgart, Germany — 2Carl von Ossietzky Universität Oldenburg, Ammerländer Heerstraße 114-118, D-26129 Oldenburg, Germany
Plasmonic tapers have been studied intensively due to the ability of adiabatically coupling the propagating surface plasmon polaritons along their shaft to the nanolocalized plasmons at their apex. Therefore, they can find applications in the fields of sub-diffraction-limit nanofocusing, ultrafast photoemission, and near-field optical microscopy.
We investigate the plasmonic modes of three-dimensional single crystalline gold tapers by means of electron energy loss spectroscopy and numerical calculation. We observe discrete higher-order azimuthal plasmonic modes of the gold taper with an opening angle of ~45° with energy dispersions roughly proportional to the inverse local radius. The importance of phase-matching between electron field and radiative taper modes in mesoscopic structure is demonstrated [1]. We further systematically study the changes in the dispersion of higher-order plasmonic modes of gold tapers versus the opening angle of the taper, both experimentally and theoretically.
[1] N. Talebi et al, ACS Nano, 2015, 9 (7), 7641-7648.