Berlin 2018 – scientific programme

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O: Fachverband Oberflächenphysik

O 77: Poster: Plasmonics and Nanooptics

O 77.6: Poster

Wednesday, March 14, 2018, 18:15–20:30, Poster A

Circular dichroism calculation of plasmonic nanohelices by boundary element method — •Daniel Nürenberg and Helmut Zacharias — Physikalisches Institut & Center For Soft Nanoscience, Münster, Germany

We present calculations on 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 calculations were carried out with a boundary element approach using the MNPBEM toolbox [1]. The inherent chirality of the nanohelices leads to a strong circular dichroism (CD). Furthermore we study the CD regarding different geometries, i.e. the size of the nanohelices in pitch and length around 100 nm. We compare the results for free helices and for helices attached to a silicon substrate and find for both very similar distributions of the intensities on the surface of the particles. The simulations can be compared with experimental reflectivity measurements.

[1] J. Waxenegger, A. Trügler, and U. Hohenester, Comput. Phys. Commun. 193, 138 (2015).