Dong Bin, Liu Junjun, Xue Man, Ni Ziyue, Guo Yuan, Huang Zhifeng, Zhang Zhen
Beijing National Laboratory of Molecular Sciences, State Key Laboratory of Molecular Reaction Dynamics, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.
University of the Chinese Academy of Sciences, Beijing 100049, China.
ACS Sens. 2021 Feb 26;6(2):454-460. doi: 10.1021/acssensors.0c02031. Epub 2020 Dec 17.
Second-harmonic generation (SHG) integrated with diverse nonlinear optical activity characterization has high sensitivity to detect the symmetry of materials at an interface, but the study is in its infancy. Here, we employ SHG with linear dichroism (or SHG-LD) to study the chiroptical origin of silver (Ag) chiral nanoparticles (CNPs) deposited by glancing angle deposition (GLAD). It is found that Ag CNPs show the chiroptical activity ascribed to not only the structural chirality (i.e., atomically chiral lattices) but also one-fold anisotropy at an interface due to the substrate rotation during GLAD. Therefore, the SHG-LD shows great potential to provide valuable complementary information to study the chiroptical properties of chiral metamaterials.
与多种非线性光学活性表征相结合的二次谐波产生（SHG）对检测界面处材料的对称性具有高灵敏度，但该研究尚处于起步阶段。在此，我们采用具有线性二向色性的SHG（即SHG-LD）来研究通过掠角沉积（GLAD）制备的银（Ag）手性纳米颗粒（CNP）的手性光学起源。研究发现，Ag CNP不仅表现出归因于结构手性（即原子手性晶格）的手性光学活性，还由于GLAD过程中基底的旋转而在界面处表现出单重各向异性。因此，SHG-LD在研究手性超材料的手性光学性质方面具有提供有价值补充信息的巨大潜力。
