Ultrafast Optical Modulation of Rationally Engineered Photonic–Plasmonic Coupling in Self-Assembled Nanocrystalline Cellulose/Silver Hybrid Material

详细信息    查看全文

• 作者：Guang Chu ; Hang Yin ; Haijing Jiang ; Dan Qu ; Ying Shi ; Dajun Ding ; Yan Xu
• 刊名：Journal of Physical Chemistry C
• 出版年：2016
• 出版时间：December 8, 2016
• 年：2016
• 卷：120
• 期：48
• 页码：27541-27547
• 全文大小：508K
• ISSN：1932-7455

文摘

Controlling light–matter interactions in optoplasmonic structures has recently attracted considerable attention due to their potential applications in metamaterials and metasurfaces. Here we present a bottom-up self-assembly method for large-scale organization of plasmonic silver nanorods (SNRs) into photonic liquid-crystalline cellulose nanocrystal matrices, exhibiting rationally engineered photonic–plasmonic coupling across the near-ultraviolet spectra range. In these metamaterials, we show that the resonant coupling of the photonic–plasmonic mode has a strong effect not only on the stationary optical response of guest SNRs but also on controlling light in ultrashort time scales. By using the time-resolved femtosecond pump–probe technique, we experimentally investigate the relaxation dynamics of SNRs embedded in hybrid photonic–plasmonic systems as the photonic band gap of the host matrix provides a varying local density of optical states to manipulate the radiative lifetimes of SNRs. The close correlation between the structure and optical properties allows for rational design of optoplasmonic composites with tailored plasmonics and light processing, and it also paves the way for a well-defined field enhancement substrate with applications in ultrasensitive spectroscopies.