Berlin 2015 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 40: Nanomaterials II: Mechanical Properties
MM 40.8: Talk
Wednesday, March 18, 2015, 17:45–18:00, H 0107
Bilayer Gold Nanostructures for Optical Activity in the Visible Range — •Katja Höflich1,2, Gaudhaman Jeevanandam2, Julia Schneider2, Caspar Haverkamp1,2, and Silke Christiansen1,2 — 1Helmholtz-Zentrum Berlin für Materialien und Energie, Hahn-Meitner-Platz 1, 14109 Berlin — 2Max-Planck-Institut für die Physik des Lichts, Günther-Scharowsky-Str. 1, 91058 Erlangen
Tailored manipulating of light onto the nanoscale is key for any nano-optical application. Especially, turning the polarization vector of mostly circularly polarized light by so-called optically active nanostructures created huge interest in the in the fast-growing field of plasmonics and metamaterials. Here we present optical activity in the visible range for chiral nanostructures combining positive with the corresponding negative L-shapes in a bilayer system with strong near-field coupling through a silicon dioxide membrane. Using electromagnetic modeling (finite difference time domain) the structures were optimized with respect to small ellipticity (defining the deformations of the incident circular polarization state) while guaranteeing large optical activity. The fabrication is based on focused ion beam milling of single-crystalline gold flakes and dedicated nano-manipulation, spectroscopic characterization was carried out in a fiber-coupled optical microscope equipped with a Horiba spectrometer.