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O: Fachverband Oberflächenphysik
O 43: Plasmonics and Nanooptics III: Periodic Structures and Theory
O 43.8: Vortrag
Dienstag, 17. März 2020, 12:15–12:30, WIL A317
Chiral Scatterometry on Chemically Synthesized Single Plasmonic Nanoparticles — •Julian Karst1, Nam Heon Cho2, Hyeohn Kim2, Hye-Eun Lee2, Ki Tae Nam2, Harald Giessen1, and Mario Hentschel1 — 14th Physics Institute and Research Center SCoPE, University of Stuttgart, Germany — 2Department of Materials Science and Engineering, Seoul National University, Korea
Being intrinsically scalable, bottom-up nanoparticle synthesis shows an ever-growing control over particle morphology, enabling even chirally selective shapes. So far, imaging technologies such as electron microscopy are mostly used to investigate the quality of the synthesis. We show that single particle chiral scatterometry holds great potential as a feedback to characterize the (chir-)optical quality of chemically synthesized nanoparticles. The spectra of single helicoid nanoparticles reveal a diverse set of chiroptical responses with hugely varying absolute chiral asymmetry in spite of the well-controlled morphology of the particles. Averaging over the single nanoparticles reproduces the solution ensemble measurement remarkably well. This demonstrates that the single particles, despite their morphological and consequently chiroptical differences, exhibit a clearly pronounced chiral spectral and structural feature. We find that the g-factor of single nanoparticles can be up to four times larger than the ensemble g-factor. This proves that chiral scatterometry can be a highly important optical feedback for bottom-up nanoparticle synthesis as it reveals that the asymmetry of the ensemble solution can be further increased and maximized by appropriate refinement methods or by post-fabrication purification.