title: Free-Standing Optically Switchable Chiral Plasmonic Photonic Crystal Based on Self-Assembled Cellulose Nanorods and Gold Nanoparticles.
abstract: Photonic crystals incorporating with plasmonic nanoparticles have recently attracted considerable attention due to their novel optical properties and potential applications in future subwavelength optics, biosensing and data storage device. Here we demonstrate a free-standing chiral plasmonic film composed of entropy-driven self-co-assembly of gold nanoparticles (GNPs) and rod-like cellulose nanocrystals (CNCs). The CNCs-GNPs composite films not only preserve the photonic ordering of the CNCs matrix but also retain the plasmonic resonance of GNPs, leading to a distinct plasmon-induced chiroptical activity and a strong resonant plasmonic-photonic coupling that is confirmed by the stationary and ultrafast transient optical response. Switchable optical activity can be obtained by either varying the incidence angle of lights, or by taking advantage of the responsive feature of the CNCs matrix. Notably, an angle-dependent plasmon resonance in chiral nematic hybrid film has been observed for the first time, which differs drastically from that of the GNPs embed in three-dimensional photonic crystals, revealing a close relation with the structure of the host matrix. The current approach for fabricating device-scale, macroscopic chiral plasmonic materials from abundant CNCs with robust chiral nematic matrix may enable the mass production of functional optical metamaterials.
authors.affiliation: State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University , 2699 Qianjin Street, Changchun 130012, China.
authors.forename: Guang
authors.initials: G
authors.lastname: Chu
authors.affiliation: State Key Laboratory of Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University , 2699 Qianjin Street, Changchun 130012, China.
authors.forename: Xuesi
authors.initials: X
authors.lastname: Wang
authors.affiliation: Institute of Atomic and Molecular Physics, Jilin University , 2699 Qianjin Street, Changchun 130012, China.
authors.forename: Hang
authors.initials: H
authors.lastname: Yin
authors.affiliation: Institute of Atomic and Molecular Physics, Jilin University , 2699 Qianjin Street, Changchun 130012, China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Shi
authors.affiliation: State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University , 2699 Qianjin Street, Changchun 130012, China.
authors.forename: Haijing
authors.initials: H
authors.lastname: Jiang
authors.affiliation: State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University , 2699 Qianjin Street, Changchun 130012, China.
authors.forename: Tianrui
authors.initials: T
authors.lastname: Chen
authors.affiliation: State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University , 2699 Qianjin Street, Changchun 130012, China.
authors.forename: Jianxiong
authors.initials: J
authors.lastname: Gao
authors.affiliation: State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University , 2699 Qianjin Street, Changchun 130012, China.
authors.forename: Dan
authors.initials: D
authors.lastname: Qu
authors.affiliation: State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University , 2699 Qianjin Street, Changchun 130012, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Xu
authors.affiliation: Institute of Atomic and Molecular Physics, Jilin University , 2699 Qianjin Street, Changchun 130012, China.
authors.forename: Dajun
authors.initials: D
authors.lastname: Ding
keywords: cellulose nanocrystals; photonic crystal; plasmonic−photonic coupling; self-assembly; switchable optical activity; transient optical response