Clamping effect driven design and fabrication of new infrared birefringent materials with large optical anisotropy  

作　　者：Linan Wang Chenchen Tu Hongbo Gao Jiazheng Zhou Hongshan Wang Zhihua Yang Shilie Pan Junjie Li 

机构地区：[1]Research Center for Crystal Materials,CAS Key Laboratory of Functional Materials and Devices for Special Environments,Xinjiang Technical Institute of Physics&Chemistry,Chinese Academy of Sciences,Urumqi 830011,China [2]Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China

出　　处：《Science China Chemistry》2023年第4期1086-1093,共8页中国科学（化学英文版）

基　　金：supported by the High-level Talent Project of Xinjiang Uygur Autonomous Region(2020000039);the National Natural Science Foundation of China(52002398,61835014,51972336);the Xinjiang Key Laboratory of Electronic Information Materials and Devices(2017D04029)。

摘　　要：Infrared(IR)birefringent materials with large optical anisotropy and wide transparency range are important for efficient light manipulation in various IR optical devices.Herein,two new IR birefringent materials AMgGeSe_(3)(A=Li,Na)with large optical anisotropy were rationally designed by a rigid octahedron and flexible dimer combined strategy and fabricated in experiment.The introduction of rigid[LiSe_(6)]/[NaSe_(6)]and[MgSe_(6)]octahedra effectively regulates the geometry and arrangement of the flexible[Ge2Se6]dimers,resulting in the birefringence as large as 0.334@1,064 nm in LiMgGeSe_(3) and 0.445@1,064 nm(the largest one in the reported[Ge_(2)Se_(6)]dimer-contained selenides)in NaMgGeSe_(3).Density functional theory(DFT)calculations and statistical analyses highlight the influence of polarizability anisotropy,density,arrangement of units,as well as layer distance on birefringence.The results indicate that AMgGeSe_(3)(A=Li,Na)crystals are the promising IR birefringent materials and it gives an insight into the exploration of new IR birefringent materials with large birefringence based on the clamping effect from rigid groups.

关 键 词：BIREFRINGENCE clamping effect AMgGeSe_(3) [Ge_(2)Se_(6)]dimer OCTAHEDRA 

分 类 号：TB34[一般工业技术—材料科学与工程]