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O: Fachverband Oberflächenphysik
O 43: Plasmonics and Nanooptics III: Periodic Structures and Theory
O 43.3: Vortrag
Dienstag, 17. März 2020, 11:00–11:15, WIL A317
Solution of electrodynamics on plasmonic nanohelices by boundary element method — •Daniel Nürenberg1, Peer Fischer2, and Helmut Zacharias1 — 1Uni Münster Center for Soft Nanoscience, Münster — 2MPI für intelligente Systeme, Stuttgart
We present electrodynamical simulations of the absorption, scattering and near-fields of plasmonic Ag, Cu and Ag:Cu alloy nanohelices from the UV to the near infrared of the optical spectrum. The helix models were designed to reproduce helices, which were fabricated by nano glancing angle vapor deposition [1]. The calculations were carried out with a boundary element approach using the MNPBEM toolbox [2]. The inherent chirality of the nanohelices leads to a strong circular dichroism (CD), which was calculated for all directions of incidence. The CD is found to be very sensitive to the direction of the impinging light. Infact, even changes in sign of the CD are common for most wavelengths, if the incidence is changed from parallel to the helical axis to a perpendicular orientation.
[1] A.G. Mark, J.G. Gibbs, T.-C. Lee, and P. Fischer, Nat. Mater. 12, 802 (2013).
[2] J. Waxenegger, A. Trügler, and U. Hohenester, Comput. Phys. Commun. 193, 138 (2015).