Issue 1, 2021

Gallium chiral nanoshaping for circular polarization handling

Abstract

In this work we report the local growth of ordered arrays of 3D core–shell chiral nanohelices based on plasmonic gallium metal. The structures can be engineered in a single step using focused ion beam induced deposition, where a Ga+ ion source is used to shape the metallic nanohelix core, while the dielectric precursor is dissociated to create dielectric shells. The solubility of gallium in the different investigated dielectric matrices controls the core–shell thickness ratio of the nanohelices. The chiral plasmonic behaviour of these gallium-based nanostructures is experimentally measured by circularly polarized light transmission through nanostructure arrays and compared with numerical simulations. Large chiroptical effects in the visible range are demonstrated due to the plasmonic effects arising from gallium nanoclusters in the core.

Graphical abstract: Gallium chiral nanoshaping for circular polarization handling

Supplementary files

Article information

Article type
Communication
Submitted
02 Jul 2020
Accepted
21 Oct 2020
First published
22 Oct 2020
This article is Open Access
Creative Commons BY-NC license

Mater. Horiz., 2021,8, 187-196

Gallium chiral nanoshaping for circular polarization handling

M. Cuscunà, M. Manoccio, M. Esposito, M. Scuderi, G. Nicotra, I. Tarantini, A. Melcarne, V. Tasco, M. Losurdo and A. Passaseo, Mater. Horiz., 2021, 8, 187 DOI: 10.1039/D0MH01078B

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