Achieving effective balance between bandgap and birefringence by confining p-conjugation in an optically anisotropic crystal  

通过π共轭限域策略实现了光学各向异性晶体中带隙和双折射的有效平衡

作　　者：Yang Zhou Xu Zhang Maochun Hong Junhua Luo Sangen Zhao 周洋;张旭;洪茂椿;罗军华;赵三根(State Key Laboratory of Structural Chemistry,Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences,Fuzhou 350002,China;Jiangxi University of Science and Technology,Ganzhou 341000,China;University of the Chinese Academy of Sciences,Beijing 100049,China;Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China,Fuzhou 350108,China)

机构地区：[1]State Key Laboratory of Structural Chemistry,Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences,Fuzhou 350002,China [2]Jiangxi University of Science and Technology,Ganzhou 341000,China [3]University of the Chinese Academy of Sciences,Beijing 100049,China [4]Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China,Fuzhou 350108,China

出　　处：《Science Bulletin》2022年第22期2276-2279,共4页科学通报（英文版）

基　　金：supported by the National Natural Science Foundation of China(21833010,22193042,22125110,21921001,22122507,61975207,and U21A2069);the Youth Innovation Promotion of Chinese Academy of Sciences(Y202069);the Natural Science Foundation of Fujian Province(2021J01523 and2022J02012);the Key Research Program of Frontier Sciences of the Chinese Academy of Sciences(ZDBS-LY-SLH024);Fujian Institute of Innovation in Chinese Academy of Sciences(FJCXY18010201);Young Talent Supporting Project of Fujian Association of Science and Technology(2021000008);the National Postdoctoral Program for Innovative Talents(BX2021315);the National Key Research and Development Program of China(2019YFA0210402).

摘　　要：Birefringence arises when the propagation speed and refractive index of light in an optically anisotropic crystal changes in response to the direction of vibration.Thus,birefringence belongs to linear optical anisotropy and is a key parameter for linear optoelectronic functional crystals,such as birefringent crystals,which are widely used to modulate the polarization of light in optoelectronic areas[1].In terms of practical applications,there is still an urgent need for wide-bandgap birefringent crystals as they allow for the modulation of light polarization in short-wavelength UV waves and even in the deep-UV spectral region.光学各向异性晶体受限于带隙和双折射之间的权衡.本文采用简单的溶液法获得了一例光学各向异性晶体NaPO(NH)(CO).值得注意的是,NaPO(NH)(CO)晶体同时具有大的光学各向异性(Δn=0.280@550 nm)和较宽的带隙(E≥6.5 eV).就我们所知,NaPO(NH)(CO)的双折射远大于目前的商用宽带隙双折射晶体.理论计算表明,这种优异的光学性能归因于[PO(NH)(CO)]~-结构单元中的π共轭限域效应.其中,非π共轭PO(NH)四面体部分解耦了π共轭之间的相互作用.这项工作将通过操纵偏振来促进新型光学各向异性宽带隙晶体的合理设计和合成,并用作高效光隔离器或其他器件.

关 键 词：双折射晶体 光隔离器 光学各向异性 宽带隙 限域效应 结构单元 光学性能 溶液法 

分 类 号：O734[理学—晶体学]