Yinxia Du

Yinxia Du and Chunmei Huang contributed equally to this work Y.Du, C.Huang, H.Wang, et al. “Linear [ICl2] Units Induced Giant Optical Anisotropy in AICl2 (A = NH4, Rb): A Pathway to Advanced Birefringent Materials.” Advanced Functional Materials (2026): e76022. https://doi.org/10.1002/adfm.76022 Conflicts of Interest The authors declare no conflicts of interest. Data Availability Statement The data that support the findings of this study are available in the supplementary material of this article.

1 Introduction Birefringent materials play a crucial role in light manipulation for preparing optical isolators, polarizers, and phase retarders.[1-3] These components are widely used in numerous scientific and engineering fields, including optical communication, polarimetry, and laser technology.[4, 5] Usually, the performance of devices is principally governed by the phase retardance (φ) between ordinary and extraordinary rays—a parameter determined by the material's birefringence (∆n) and...