Plasmonic oligomers in cylindrical vector light beams

• Main Authors: Mario Hentschel, Jens Dorfmüller, Harald Giessen, Sebastian Jäger, Andreas M. Kern, Kai Braun, Dai Zhang, Alfred J. Meixner
• Format: Article
• Language: English
• Published: Beilstein-Institut 2013-01-01
• Series: Beilstein Journal of Nanotechnology
• Subjects: near-field microscopy; oligomers; plasmons; radial and azimuthal polarization
• Online Access: https://doi.org/10.3762/bjnano.4.6

We investigate the excitation as well as propagation of magnetic modes in plasmonic nanostructures. Such structures are particularly suited for excitation with cylindrical vector beams. We study magneto-inductive coupling between adjacent nanostructures. We utilize high-resolution lithographic techniques for the preparation of complex nanostructures consisting of gold as well as aluminium. These structures are subsequently characterized by linear optical spectroscopy. The well characterized and designed structures are afterwards studied in depth by exciting them with radial and azimuthally polarized light and simultaneously measuring their plasmonic near-field behavior. Additionally, we attempt to model and simulate our results, a project which has, to the best of our knowledge, not been attempted so far.