Research Center for Crystal Materials, CAS Key Laboratory of Functional Materials and Devices for Special Environments, Xinjiang Technical Institute of Physics & Chemistry, CAS, 40-1 South Beijing Road, 830011, Urumqi, China.
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, 100049, Beijing, China.
Angew Chem Int Ed Engl. 2023 May 22;62(22):e202303711. doi: 10.1002/anie.202303711. Epub 2023 Apr 25.
Birefringent crystals are requisite optical devices in laser and modern opto-electronic fields. Development of excellent birefringent materials is still challenging. Herein, the linear or chain-like [S ] (x=2-6) species were theoretically proved to be the origin of the large birefringence, and could be regarded as birefringent genes. Besides, the metal polysulfide family was first proposed to be rich birefringent materials source, among which Cs S realizes giant birefringence 0.58@1064 nm together with a wide band gap of 1.70 eV (based on the generalized gradient approximation). Moreover, the first dual-anion group polysulfide Na Ba (S ) S was obtained, showing wide infrared transmission range (0.5-6.2 μm), wide band gap (2.3 eV), and large birefringence (0.37 at 1064 nm). This work provides a new guiding thought for exploring large birefringence crystals in the future.
双折射晶体是激光和现代光电子领域所必需的光学器件。开发优异的双折射材料仍然具有挑战性。在此，理论上证明了线性或链状[S ]（x=2-6）物种是大双折射的起源，可被视为双折射基因。此外，首次提出金属多硫化物家族是丰富的双折射材料来源，其中 CsS 在 1064nm 处实现了巨大的双折射 0.58@1.70eV（基于广义梯度近似）。此外，还获得了首个双阴离子基团多硫化物 NaBa（S ）S，具有宽红外透过范围（0.5-6.2μm）、宽能带隙（2.3eV）和大双折射（1064nm 处为 0.37）。这项工作为未来探索大双折射晶体提供了新的指导思路。
