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BIT Makes Important Progress in Nano-paper-cut-deformable Stereo Supersurfaces

release date :2020-03-03 10:27:00  |   [ close window ]ViewCount:

  Beijing Institute of Technology,March 2nd,2020: Recently, the team of Li Jiafang, Zhang Xiangdong and Yao Yugui from the School of Physics of Beijing Institute of Technology(BIT), together with the team from the Institute of Physics of the Chinese Academy of Sciences, Professor Xu Yi and Professor Li Xiangping from Jinan University, fabricated a novel deformable three-dimensional supersurface structure, which has excellent optical chirality and reversible on-chip tuning of circular dichroism. The innovation is published on the top international journal Advanced Materials (IF: 25.809).

  Artificial three-dimensional metamaterials and two-dimensional supersurfaces are two important frontier research fields in nano-photonics. Among them, Optical Band metamaterials are facing challenges in 3d nano-fabrication, and 2D supersurfaces are in urgent need of development in dynamic tuning. To solve these problems, in 2018, Li and his team invented a nanopaper cutting technology [Science Advances 4, EAAT44362018] , which implemented a series of novel 3D and quasi-3D nanostructures [ Nanophotonics 7,16372018; phoapl 3,100803(2018)]. Since joining the School of Physics of BIT in 2018, Professor Li Jiafang has continued to work with the team of the Institute of Physics of the Chinese Academy of Sciences to fabricate a novel "2.5-d" three-dimensional supersurface structure using nano-paper-cutting technology, in addition to overcoming the difficulty of fabricating 3D metamaterials, the team also found a novel Fano Resonance Enhancement Mechanism to achieve Super Optical chirality.

  Chirality is a basic property that exists widely in nature. It can be found from celestial body to molecule. However, the optical chirality of natural structures is generally very weak and difficult to control. To solve this problem, the team used nano-paper-cutting technology to create chiral supermolecules in a variety of configurations, by studying the effects of surface deformations and symmetry, lattice symmetry, and periodic arrangement of chiral molecules, the circular dichroism characteristic of near infrared band can be tailored flexibly.

  The dynamic tuning of three-dimensional metamaterials and two-dimensional supersurfaces in optical frequency band are one of the obstacles in the application of devices in this field. The reported solid supersurface has novel three-dimensional distorted morphology and reversible deformation characteristics, and has the potential of dynamic control. To this end, the team experimentally achieved on-chip reversible tunability of circular dichroism in the near-infrared band using single-mode optical fibers to repeatedly compress and release Stereo hypersurfaces, it provides an important technical reference for the dynamic regulation and control of solid supersurfaces in the fields of force, heat, light, electricity, magnetism and sound.

Photo 1 Solid supersurface, supramolecular structure and Fano Resonance Enhanced Circular Dichroism.

Photo 2: Experimental preparation of solid supersurface and its enhanced circular dichroism.

Photo3: Reversible Dynamic Tuning of circular dichroism on hypersurface.

  The research work provides a novel platform for the integration of reconfigurable photonic devices and chips, and has an important application prospect in optical sensing, chiral light source, microfluidic devices, mems / nano-mechatronics, etc. Dr. Liu Zhiguang (with the main support of BIT), Professor Xu Yi and doctoral student Ji Changyin are the co-lead authors of the paper, and Professor Li Jiafang of the School of Physics in BIT is the corresponding author. The research team is particularly grateful for the cooperation and support of the Optical Physics Laboratory and the microfabrication laboratory of the Institute of Physics of CAS, thanks to Prof. Fang Xuanlai of MIT, Prof. Li Zhiyuan of South China University of Technology, and researcher Lu Ling of the Institute of Physics of CAS for their support and assistance. This work has been supported by the National Natural Science Foundation of China (NSFC), Key Projects, National Key R & D Program, BIT Academic Startup Project, Guangdong Natural Science Foundation, etc.

  Article Information:Zhiguang Liu#, Yi Xu#, Chang-Yin Ji#, Shanshan Chen, Xiangping Li, Xiangdong Zhang, Yugui Yao, and Jiafang Li*, “Fano-enhanced circular dichroism in deformable stereo metasurfaces”, Advanced Materials 32, 1907077 (2020). (# For co-authors; * For Correspondence Writers)

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Editor:News Agency of BIT
Translator: Ren qinduoriji, News Agency of BIT

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