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O: Fachverband Oberflächenphysik
O 2: Plasmonics and Nanooptics I: Light-Matter Interaction
O 2.7: Vortrag
Montag, 7. März 2016, 12:15–12:30, S054
Circular Dichroism Spectroscopy on Individual Plasmonic Nanoparticles — •Julian Karst1, Nikolai Strohfeldt1, Mario Hentschel1, Harald Giessen1, and Na Liu2 — 14th Physics Institute and Research Center SCoPE, University of Stuttgart, Germany — 2Max-Planck-Institute for Intelligent Systems, Stuttgart, Germany
Chirality is one of the most important basic principles of nature. We analyze the chiroptical response of single chiral plasmonic nanostructures. We utilize dark field circular dichroism spectroscopy to study the response of individual 3D chiral plasmonic Au-nanostructures. A customized spectroscopy setup for the visible spectral range is used. Transmission and scattering spectra are measured with a bright field and dark field spectroscopy setup, respectively. With large area ensembles of achiral and chiral plasmonic nanostructures we determine the influence of several optical components in the light path as well as the influence of fabrication defects. We show that individual chiral plasmonic oligomers in C1 and C4 configuration exhibit a mirror symmetry in the circular dichroism spectra for the right- and left-handed enantiomers. However, we see clear differences in the response of C1-symmetric Au-nanostructures compared to the polarization conversion suppressing C4-symmetric structures. The successful measurements of the chiroptical response of single chiral three dimensional plasmonic oligomers pave the way for studying more complex individual DNA based chiral plasmonic nanostructures.