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Structure-Dependent Chiroptical Properties of Twisted Multilayered Silver Nanowire Assemblies

Abstract : The optical properties of chiral plasmonic metasurfaces depend strongly on their architecture, in particular the orientation and spacing between the individual building blocks assembled into large arrays. However, methods to obtain chiral metamaterials with fully tunable chiroptical properties in the UV, visible and near infrared range are scarce. Here, we show that the chiroptical properties of silver nanowires assembled in helical nanostructures by Grazing Incidence Spraying and Layer-by-Layer assembly can be finely tuned over a broad wavelength range using simple design principles. The angle between the oriented nanowire layers controls the intensity of the circular dichroism, reaching ellipticity values higher than 13° and g-factor values up to 1.6, while the shape of the circular dichroism spectra depends strongly on the spacing between the layers which can be tuned at the nm-scale. The structure-dependent optical properties of the assembly are successfully modeled using a transfer matrix approach.
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https://hal.univ-lorraine.fr/hal-03547843
Contributor : Yann Battie Connect in order to contact the contributor
Submitted on : Friday, January 28, 2022 - 10:13:57 PM
Last modification on : Friday, April 1, 2022 - 3:57:54 AM
Long-term archiving on: : Friday, April 29, 2022 - 9:49:23 PM

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Wenbing Wu, Yann Battie, Vincent Lemaire, Gero Decher, Matthias Pauly. Structure-Dependent Chiroptical Properties of Twisted Multilayered Silver Nanowire Assemblies. Nano Letters, American Chemical Society, 2021, 21 (19), pp.8298-8303. ⟨10.1021/acs.nanolett.1c02812⟩. ⟨hal-03547843⟩

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