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Single Nanoparticle Chiroptics in a Liquid: Optical Activity in Hyper-Rayleigh Scattering from Au Helicoids.


ABSTRACT: Linear optical methods of determining the chirality of organic and inorganic materials have relied on weak chiral optical (chiroptical) effects. Nonlinear chiroptical characterization holds the potential of much greater sensitivity and smaller interaction volumes. However, suitable materials on which to perform measurements have been lacking for decades. Here, we present the first nonlinear chiroptical characterization of crystallographic chirality in gold helicoids (?150 nm size) and core/shell helicoids with the newly discovered hyper-Rayleigh scattering optical activity (HRS OA) technique. The observed chiroptical signal is, on average, originating from between ?0.05 and ?0.13 helicoids, i.e., less than a single nanoparticle. The measured HRS OA ellipticities reach ?3°, for a concentration ?109 times smaller than that of chiral molecules with similar nonlinear chiroptical response. These huge values indicate that the helicoids are excellent candidates for future nonlinear chiroptical materials and applications.

SUBMITTER: Ohnoutek L 

PROVIDER: S-EPMC7467767 | biostudies-literature | 2020 Aug

REPOSITORIES: biostudies-literature

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Single Nanoparticle Chiroptics in a Liquid: Optical Activity in Hyper-Rayleigh Scattering from Au Helicoids.

Ohnoutek Lukas L   Cho Nam Heon NH   Allen Murphy Alexander William AW   Kim Hyeohn H   Răsădean Dora Maria DM   Pantoş Gheorghe Dan GD   Nam Ki Tae KT   Valev Ventsislav Kolev VK  

Nano letters 20200720 8


Linear optical methods of determining the chirality of organic and inorganic materials have relied on weak chiral optical (chiroptical) effects. Nonlinear chiroptical characterization holds the potential of much greater sensitivity and smaller interaction volumes. However, suitable materials on which to perform measurements have been lacking for decades. Here, we present the first nonlinear chiroptical characterization of crystallographic chirality in gold helicoids (≈150 nm size) and core/shell  ...[more]

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