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<p>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-&#xa0;to&#xa0;far-infrared region, simultaneously achieving large birefringence and broad transparency within a single material remains a major challenge. Herein, we report the synthesis of Hg<sub>18</sub>Ga<sub>8</sub>Se<sub>8</sub>Cl<sub>32</sub> (HGSC), a crystalline material featuring linear [Hg<sub>3</sub>Se<sub>2</sub>] 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 [Hg<sub>3</sub>Se<sub>2</sub>]<sup>2-</sup> clusters, which exhibit the highest polarizability anisotropy (<i>δ</i> = 430) among all reported birefringence-active functional units. The demonstration of [Hg<sub>3</sub>Se<sub>2</sub>]<sup>2-</sup> clusters as an effective bifunctional unit offers new opportunities for designing infrared photonic materials.</p>

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[Hg3Se2]2- cluster drives giant optical anisotropy and broad infrared transparency

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月6日

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  • Qixian Ren,
  • Chen Cui,
  • Xinchen Chen,
  • Yabo Wu,
  • Ran An,
  • Zhihua Yang,
  • Shilie Pan

摘要

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.