Berlin 2018 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 13: Plasmonics and nanooptics: Light-matter interaction, spectroscopy I

O 13.3: Vortrag

Montag, 12. März 2018, 15:30–15:45, MA 041

Single Plasmonic Particle Chiral Spectroscopy — •Julian Karst, Mario Hentschel, Nikolai Strohfeldt, and Harald Giessen — 4th Physics Insitute and Research Center SCoPE, University of Stuttgart

Chirality plays a crucial role in our everyday lives. Virtually all studies are performed on large ensembles of chiral objects, which obstructs the contribution of the individual particle. Hence, it is highly desirable to study individual chiral objects. Here, we show that we are able to measure reproducibly circular dichroism spectra in the visible spectral range of left and right handed C4 symmetric single plasmonic oligomer. We utilize darkfield scattering spectroscopy as well as correlative scattering electron microscopy in order to study the influence of structural arrangement and shape on the optical properties of a single plasmonic oligomer. Our two-layered oligomers are fabricated by top-down electron beam lithography to offer a high degree of structural control. We find that even minute structural differences, which we cannot resolve in scanning electron microscopy, manifest themselves in clear differences in the chiroptical response. Our results play an important role for further investigations and optimizations in design, fabrication, and measurements of single plasmonic enantiomers, but also on the way towards single chiral molecule sensing.