2026-01-22 中国科学院（CAS）
＜関連情報＞
- https://english.cas.cn/newsroom/research_news/chem/202601/t20260126_1146551.shtml
- https://www.nature.com/articles/s41467-025-66148-2
[Hg 3 Se 2 ] 2クラスターは巨大な光学異方性と広い赤外線透過性をもたらす [Hg3Se2]2- cluster drives giant optical anisotropy and broad infrared transparency
Qixian Ren,Chen Cui,Xinchen Chen,Yabo Wu,Ran An,Zhihua Yang & Shilie Pan
Nature Communications Published:06 January 2026
DOI:https://doi.org/10.1038/s41467-025-66148-2
Abstract
Optical anisotropy, a fundamental physical property for polarization control, has long presented a critical consideration in the development of optical materials, particularly in terms of its modulation mechanisms and performance optimization. In the mid- to far-infrared region, simultaneously achieving large birefringence and broad transparency within a single material remains a major challenge. Herein, we report the synthesis of Hg18Ga8Se8Cl32 (HGSC), a crystalline material featuring linear [Hg3Se2] structural units. HGSC demonstrates a large birefringence of 0.871 at 546 nm, accompanied by the broadest transparency window among Hg-based chalcogenide single crystals (0.4 to 25 µm). Theoretical calculations reveal that the significant birefringence of HGSC originates from the well-aligned linear [Hg3Se2]2- clusters, which exhibit the highest polarizability anisotropy (δ = 430) among all reported birefringence-active functional units. The demonstration of [Hg3Se2]2- clusters as an effective bifunctional unit offers new opportunities for designing infrared photonic materials.
