Tuning the Chiroptical Properties of Elongated Nano-objects via Hierarchical Organization

Jie Gao (1) , Wenbing Wu (2) , Vincent Lemaire (2) , Alain Carvalho (2) , Sylvain Nlate (1) , Thierry Buffeteau (3) , Reiko Oda (1) , Yann Battie (4) , Matthias Pauly (2) , Emilie Pouget (1)

1 CBMN - Chimie et Biologie des Membranes et des Nanoobjets
2 ICS - Institut Charles Sadron
3 ISM - Institut des Sciences Moléculaires
4 LCP-A2MC - Laboratoire de Chimie et Physique - Approche Multi-échelle des Milieux Complexes

Chiral materials appear as excellent candidates to control and manipulate the polarization of light in optical devices. In nano-photonics, the self-assembly of colloidal plasmonic nanoparticles gives rise to strong resonances in the visible range and, when such organizations are chiral, strong chiroplasmonic effect can be observed. In the present work, we describe the optical properties of chiral artificial nano-photonic materials, Goldhelices, which are hierarchically organized by Grazing Incidence Spraying. These Goldhelices are made by plasmonic nanoparticles (gold) grafted onto helical templates made from silica nanohelices. A comparison of oriented vs non-oriented surfaces has been performed by Mueller matrix polarimetry, showing the importance of the organization of the Goldhelices regarding their interaction with light. Moreover, mono-vs multi-layers photonic films are created and the measured optical properties are discussed and compared to simulations.

Mots clés: Nanoparticles; Layers; Thin films; Chirality; Optical properties

Domaines: Matériaux

Jie Gao, Wenbing Wu, Vincent Lemaire, Alain Carvalho, Sylvain Nlate, et al.. Tuning the Chiroptical Properties of Elongated Nano-objects via Hierarchical Organization. ACS Nano, 2020, 14 (4), pp.4111-4121. ⟨10.1021/acsnano.9b08823⟩. ⟨hal-03015893⟩