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O: Fachverband Oberflächenphysik
O 76: Plasmonics and Nanooptics V: Tunable Structures and Nanoparticles (joint session O/CPP)
O 76.6: Vortrag
Mittwoch, 18. März 2020, 16:45–17:00, WIL A317
Mode conversion in tilted plasmonic nanocones confirmed by second harmonic imaging — Christoph Dreser1, Dominik A. Gollmer1, Godofredo Bautista2, Xiaorun Zang2, Dieter P. Kern1, Martti Kauranen2, and •Monika Fleischer1 — 1Institute for Applied Physics and Center LISA+, Eberhard Karls University of Tübingen, Germany — 2Laboratory of Photonics, Tampere University, Finland
Plasmonic nanocones offer strong, highly localized near-fields at the cone apex that can be utilized for applications in microscopy and sensing. However, for an efficient excitation of the tip mode the electric field vector of the exciting electromagnetic wave needs to have a significant component parallel to the vertical axis. To enable the excitation of the tip mode under vertical illumination, two processes for the nanofabrication of tilted gold nanocones with defined tip displacements are presented. The asymmetric geometry supports the transformation of an in-plane electric far-field to an out-of-plane plasmonic excitation. Extinction spectra and corresponding simulations will be shown, in which cones with different tilting angles are illuminated under various illumination angles. The tip excitation is confirmed by the nonlinear optical properties of the nanocones observed in second harmonic generation scanning microscopy with cylindrical vector beams.
[C. Dreser et al., Nanoscale 11, 5429 (2019)]