Ma Yu, Wang Beibei, Li Wenjing, Liu Yi, Guo Wuqian, Xu Haojie, Tang Liwei, Fan Qingshun, Luo Junhua, Sun Zhihua
State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, People's Republic of China.
University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing 100039, People's Republic of China.
J Am Chem Soc. 2024 Oct 9;146(40):27287-27292. doi: 10.1021/jacs.4c10415. Epub 2024 Sep 30.
Birefringent crystals hold a significant position in optical and optoelectronic fields due to their capability to control polarized light. Despite various chemical strategies devoted to designing birefringent crystals, it remains a challenge to switch and manipulate birefringence under physical stimuli. Here we present an unusual triple-state switching of birefringence in a 2D perovskite ferroelectric, (-methylcyclohexylammonium)PbCl (), which exhibits two reversible phase transitions at 361 and 373 K. The in-plane birefringence of (Δ) shows three distinctive states inside the plane, namely, the low-, high-, and zero-Δ states. Strikingly, a huge augmentation of Δ is solidly confirmed up to ∼400% between its low and high states, far beyond other birefringent materials. The origin of this triple-state switching of birefringence involves the variation of the ferroelastic strain and domain in the vicinity of the phase transition. As an entirely new mode of switching birefringence, this work facilitates the further development of new intelligent nonlinear optics.
双折射晶体因其控制偏振光的能力而在光学和光电子领域占据重要地位。尽管有各种致力于设计双折射晶体的化学策略，但在物理刺激下切换和操纵双折射仍然是一个挑战。在此，我们展示了二维钙钛矿铁电体（-甲基环己基铵）PbCl（）中一种不寻常的双折射三态切换，它在361 K和373 K时表现出两个可逆相变。（Δ）的面内双折射在平面内呈现出三种不同状态，即低Δ、高Δ和零Δ状态。令人惊讶的是，其低态和高态之间的Δ大幅增加，确凿证实高达约400%，远超其他双折射材料。这种双折射三态切换的起源涉及相变附近铁弹性应变和畴的变化。作为一种全新的双折射切换模式，这项工作推动了新型智能非线性光学的进一步发展。
