期刊
ACS APPLIED MATERIALS & INTERFACES
卷 7, 期 39, 页码 21797-21806出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b05645
关键词
photonic crystal; self-assembly; cellulose nanocrystals; plasmonic-photonic coupling; transient optical response; switchable optical activity
资金
- National Natural Science Foundation of China [21171067, 21373100]
- Jilin Provincial Talent Funds [802110000412]
- Tang Aoqing Professor Funds of Jilin University [450091105161]
Photonic crystals incorporating with plasmonic nanopartides 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.
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