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Integration of Optical Surface Structures with Chiral Nanocellulose for Enhanced Chiroptical Properties
Author(s) -
Xiong Rui,
Yu Shengtao,
Kang Saewon,
Adstedt Katarina M.,
Nepal Dhriti,
Bunning Timothy J.,
Tsukruk Vladimir V.
Publication year - 2020
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201905600
Subject(s) - materials science , nanocellulose , photonics , nanotechnology , circular polarization , circular dichroism , polarizer , photonic metamaterial , nanostructure , photonic crystal , structural coloration , chirality (physics) , optoelectronics , optics , birefringence , cellulose , chemical engineering , chemistry , physics , chiral symmetry breaking , quantum mechanics , engineering , crystallography , microstrip , quark , nambu–jona lasinio model
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.