Substrate-Induced Chirality in an Individual Nanostructure

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Abstract

We experimentally investigate the chiral optical response of an individual nanostructure consisting of three equally sized spherical nanoparticles made of different materials and arranged in 90° bent geometry. Placing the nanostructure on a substrate converts its morphology from achiral to chiral. Chirality leads to pronounced differential extinction (circular dichroism) and optical rotation (circular birefringence), which would be strictly forbidden in the absence of a substrate or heterogeneity. This first experimental observation of the substrate-induced break of symmetry in an individual heterogeneous nanostructure sheds new light on chiral light-matter interactions at substrate-nanostructure interfaces.

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Nechayev, S., Barczyk, R., Mick, U., & Banzer, P. (2019). Substrate-Induced Chirality in an Individual Nanostructure. ACS Photonics, 6(8), 1876–1881. https://doi.org/10.1021/acsphotonics.9b00748

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