Integration of Optical Surface Structures with Chiral Nanocellulose for Enhanced Chiroptical Properties. Issue 2 (27th November 2019)

• Record Type: Journal Article
• Authors: Xiong, Rui; Yu, Shengtao; Kang, Saewon; Adstedt, Katarina M.; Nepal, Dhriti; Bunning, Timothy J.; Tsukruk, Vladimir V.
• Is Part Of: Advanced materials. Volume 32:Issue 2(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-11-27
• Subjects: asymmetric broadband circular dichroism -- biophotonics -- cellulose nanocrystals -- chiral films -- cholesteric phases -- microlenses -- surface gratings; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adma.201905600
• Languages: English
• ISSNs: 0935-9648

Abstract

Abstract: The integration of chiral organization with photonic structures found in many living creatures enables unique chiral photonic structures with a combination of selective light reflection, light propagation, and circular dichroism. Inspired by these natural integrated nanostructures, hierarchical chiroptical systems that combine imprinted surface optical structures with the natural chiral organization of cellulose nanocrystals are fabricated. Different periodic photonic surface structures with rich diffraction phenomena, including various optical gratings and microlenses, are replicated into nanocellulose film surfaces over large areas. The resulting films with embedded optical elements exhibit vivid, controllable structural coloration combined with highly asymmetric broadband circular dichroism and a microfocusing capability not typically found in traditional photonic bioderived materials without compromising their mechanical strength. The strategy of imprinting surface optical structures onto chiral biomaterials facilitates a range of prospective photonic applications, including stereoscopic displays, polarization encoding, chiral polarizers, and colorimetric chiral biosensing. Abstract : Hierarchical chiroptical systems are constructed by combining imprinted surface optical structures, including optical gratings and microlenses, with the natural chiral organization of cellulose nanocrystals. The resulting biofilms with embedded optical elements exhibit vivid, controllable structural coloration combined with highly asymmetric broadband circular dichroism and a microfocusing capability not typically found in traditional photonic bioderived materials.