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Chiral phenomena are widespread in nature, and molecular phenomena such as DNA and protein are already known at the molecular level. In recent years, plasma metal nanostructures having chiral optical response characteristics in the visible light region have attracted more and more attention. The manufacture and optical activity of chiral plasma nanostructures have given rise to emerging research fields in chiral plasma optics. Although a large number of studies have reported the use of isotropic metal nanostructures to assemble chiral plasmonic nanostructures, due to the enormous difficulties in the specific spatial orientation of anisotropic elements, new chiral plasmonic nanostructures have been assembled using anisotropic elements. It has always been a difficult challenge.
In recent years, the research team of the Institute of Nanotechnology and Nanobionics of the Chinese Academy of Sciences, Wang Qiangbin, has been devoted to the assembly of anisotropic chiral plasma nanostructures at different scales. They use gold nanorods as anisotropic primitives and use DNA nanotechnology to assemble gold nanorods to fully exploit the programmability and precise addressability of DNA templates, thus solving the problem of accurate positioning of anisotropic nanomaterials in three-dimensional space. For the orientation problem, a series of three-dimensional discrete chiral structures and spiral superstructures of gold nanorods with different spatial configurations have been produced for the first time in the world. Through experimental measurements and theoretical calculations of the system, the intrinsic relationship between the plasma chiral optical activity and the discrete structure of the gold nanorods and the spatial structure of the superstructure was revealed. The results of the research were published in international journals (J. Am.). Chem. Soc., 2013, 135, 11441-11444; J. Am. Chem. Soc., 2015, 137, 457-462; J. Am. Chem. Soc., 2016, 138, 1764-1767; ACS Photonics, 2015, 2, 392-397).
Recently, the research group focused on the current state of controllable assembly of chiral plasmonic nanostructures, and the principle and method of assembly of chiral plasmonic nanostructures and chiral molecules and metal composite structures with isotropic and anisotropic motifs. A systematic review of the future of the bottom-up self-assembly principle in chiral plasma optics has been carried out in-depth analysis and outlook. Recently, a review article was published in Advanced Materials (Adv. Mater.; DOI: 10.1002/ Adma.201600697).
The above work has received strong support from the National Outstanding Youth Fund.
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