Photocontrollable Chiral Switching and Selection in Self-Assembled Plasmonic Nanostructure
Photocontrollable Chiral Switching and Selection in Self-Assembled Plasmonic Nanostructure
复制标题
自组装等离子体纳米结构中的光控手性切换和选择
DOI：
10.1002/adfm.201900587
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发表时间：
2019
影响因子：
19
通讯作者：
Zhang Xiangdong
中科院分区：
文献类型：
--
作者：
Zhao Wenjing;Zhang Weixuan;Wang Rong Yao;Ji Yinglu;Wu Xiaochun;Zhang Xiangdong
自组装体系中动态手性的可逆光控对于开发用于科学和工业应用的人工纳米机器具有重要意义。在这里，提出了一种新的策略，实现基于光开关等离子体纳米结构的光学手性控制。设计了手性等离子体纳米组装体，其响应于可见光（维斯）/近红外（NIR）区域中的圆偏振光（CPL）施加的光机械扰动。相反的手性状态之间的可逆的光开关验证了圆二色性（CD）光谱信号。理论模拟揭示了光学力矩在驱动这种手性开关中的关键作用。通过调节光偏振或调谐光频率以激发纳米结构的不同等离子体激元模式，这种光机械驱动的手性切换可以实现纳米组件中的定向镜像对称性破缺和选择性手性放大。这种基于等离子体激元的光开关纳米系统可以在光学透明窗口工作，在生命系统中的应用中显示出比大多数分子光开关更大的优势。
Reversible photocontrol of dynamic chirality in self‐assembly systems is of great importance in exploitations of artificial nanomachines for scientific and industrious applications. Here, a new strategy is proposed for achieving optically chiral controls based on photoswitchable plasmonic nanostructures. Chiral plasmonic nanoassemblies that are responsive to optomechanical perturbations exerted by circular polarized light (CPL) in the visible (vis)/near infrared (NIR) region are designed. The reversible photoswitching between opposite chiral states is verified by circular dichroism (CD) spectral signals. Theoretical simulations reveal the key role of optical torques in driving this chiral switching. By regulating light polarization or tuning light frequency to excite different plasmonic modes of the nanostructures, such an optomechanically driven chiral switching can enable a directed mirror‐symmetry breaking and selective chiral amplification in nanoassemblies. This plasmon‐based photoswitching nanosystem can operate at the optical transparent window, showing particular advantages over most of the molecular photoswitches for applications in living systems.