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<p>Two-dimensional (2D) van der Waals materials with strong in-plane anisotropy are emerging as fertile platforms for nanophotonics beyond conventional isotropic noble metals and dielectrics. Here, we demonstrate hyperbolic localized plasmon resonances (H-LPRs) in MoOCl<sub>2</sub>, a representative anisotropic 2D crystal. Unlike conventional plasmons, H-LPRs arise directly from the crystal anisotropy and show unprecedented properties: (i) one-dimensional resonances in circularly symmetric nanodisks, (ii) Z-gap independence in metal–insulator–metal heterostructures, and (iii) twist-induced chirality with circular dichroism values exceeding 0.65. The H-LPRs are characterized by both far-field spectra and near-field imaging. By stacking twisted MoOCl<sub>2</sub> flakes, we bridge H-LPRs with concepts of moiré photonics and twistronics, introducing a new degree of freedom in plasmonic design. These findings establish H-LPRs in anisotropic 2D materials as a generalizable and versatile platform for polarization engineering, ultrasensitive chiral sensing, and integration into compact on-chip and quantum nanophotonic devices.</p>

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Hyperbolic localized plasmons and twist-induced chirality in an anisotropic 2D material

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年2月13日

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  • Yaolong Li,
  • Xu Shi,
  • Yuxin Zhang,
  • Yen-En Liu,
  • Hong Yang,
  • Guowei Lyu,
  • Yasutaka Matsuo,
  • Xiaoyong Hu,
  • Qihuang Gong,
  • Hiroaki Misawa

摘要

Two-dimensional (2D) van der Waals materials with strong in-plane anisotropy are emerging as fertile platforms for nanophotonics beyond conventional isotropic noble metals and dielectrics. Here, we demonstrate hyperbolic localized plasmon resonances (H-LPRs) in MoOCl2, a representative anisotropic 2D crystal. Unlike conventional plasmons, H-LPRs arise directly from the crystal anisotropy and show unprecedented properties: (i) one-dimensional resonances in circularly symmetric nanodisks, (ii) Z-gap independence in metal–insulator–metal heterostructures, and (iii) twist-induced chirality with circular dichroism values exceeding 0.65. The H-LPRs are characterized by both far-field spectra and near-field imaging. By stacking twisted MoOCl2 flakes, we bridge H-LPRs with concepts of moiré photonics and twistronics, introducing a new degree of freedom in plasmonic design. These findings establish H-LPRs in anisotropic 2D materials as a generalizable and versatile platform for polarization engineering, ultrasensitive chiral sensing, and integration into compact on-chip and quantum nanophotonic devices.