Jeong Ki-Jae, Lee Dong Kyu, Tran Van Tan, Wang Caifeng, Lv Jiawei, Park Jinhae, Tang Zhiyong, Lee Jaebeom
Department of Cogno-Mechatronics Engineering, Pusan National University, Busan, 46279, Republic of Korea.
Research Institute of Materials Chemistry, Chungnam National University, Daejeon, 34134, Republic of Korea.
ACS Nano. 2020 Jun 23;14(6):7152-7160. doi: 10.1021/acsnano.0c02026. Epub 2020 Apr 21.
The astrophysical phenomenon of mimetic helical magnetic field ()-assisted self-assembly is herein introduced to build helical superstructures that display chiroptical properties. As a building block, magnetoplasmonic (MagPlas) Ag@FeO core-shell nanoparticles are used to guide plasmonic Ag nanoparticles onto a helical magnetic flux. The chirality of the assembled helical structures and tailored circular dichroism are successfully tuned in real time, and the handedness of the assembled structures is dynamically switched by the at the millisecond level, which is at least 6000-fold faster than other template-assisted methods. The peak position of circular dichroism can be reconfigured by altering the plasmonic resonance or coupling by controlling the size of the Ag core and magnetic flux density. The -induced chirality modulation represents a method to control the polarization state of light at the nexus of plasmonics, magnetic self-assembly, colloidal science, liquid crystals, and chirality. It presents active and dynamic chiral assemblies of magnetoplasmonic nanomaterials, enabling further practical applications in optical devices.
本文引入了模拟螺旋磁场（）辅助自组装的天体物理现象，以构建具有手性光学性质的螺旋超结构。作为构建单元，磁等离子体（MagPlas）Ag@FeO核壳纳米颗粒用于将等离子体Ag纳米颗粒引导到螺旋磁通量上。成功实时调整了组装螺旋结构的手性和定制的圆二色性，并且通过在毫秒级的磁场动态切换组装结构的手性，这比其他模板辅助方法至少快6000倍。通过控制Ag核的尺寸和磁通量密度来改变等离子体共振或耦合，可以重新配置圆二色性的峰值位置。磁场诱导的手性调制代表了一种在等离子体、磁自组装、胶体科学、液晶和手性的交叉点上控制光偏振态的方法。它展示了磁等离子体纳米材料的活性和动态手性组装，为光学器件的进一步实际应用提供了可能。
