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<p>The rapid development of information technologies for terahertz (THz) sensing, wireless communication, and low-dissipation quantum computation requires ultracompact and high-efficiency THz functional devices. Spintronic-metasurface emitters, which realize diverse polarization state modulation during THz wave generation, have illuminated a revolutionary avenue for the next-generation on-chip functional THz devices. Currently, broadband polarization modulation is achieved in spintronic-metasurface emitters through rotating setups and arranging patterns. However, there has been little study on the distribution of external magnetic fields for THz radiation. Here, we demonstrate that nonuniform magnetization contributes to achieving more diverse THz chirality in patterned emitters. The symmetry of THz radiation is broken when the azimuth angle of emitters exceeds 90°, providing an effective approach to achieve full ellipticity ranging from 0 to 0.85 over the 0.5–2.5 THz frequency band. Moreover, under curved magnetization, ellipticity exceeding 0.6 can be achieved in patterned emitters, where no chiral THz waves are radiated under a uniform magnetic field. Our findings provide the capability to expand the application scenarios of integrated spin-optoelectronic devices, shedding light on potential benefits in wireless communications and biomedical detection.</p>

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Spintronic-metasurface terahertz emitters with magnetic-field manipulated polarizations

  • 期刊论文

  • 发表日期：

    2025年10月17日

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  • Qing Yang,
  • Yan Huang,
  • Houyi Cheng,
  • Jie Zhang,
  • Fan Zhang,
  • Yong Xu,
  • Lianggong Wen,
  • Weisheng Zhao,
  • Tianxiao Nie

摘要

The rapid development of information technologies for terahertz (THz) sensing, wireless communication, and low-dissipation quantum computation requires ultracompact and high-efficiency THz functional devices. Spintronic-metasurface emitters, which realize diverse polarization state modulation during THz wave generation, have illuminated a revolutionary avenue for the next-generation on-chip functional THz devices. Currently, broadband polarization modulation is achieved in spintronic-metasurface emitters through rotating setups and arranging patterns. However, there has been little study on the distribution of external magnetic fields for THz radiation. Here, we demonstrate that nonuniform magnetization contributes to achieving more diverse THz chirality in patterned emitters. The symmetry of THz radiation is broken when the azimuth angle of emitters exceeds 90°, providing an effective approach to achieve full ellipticity ranging from 0 to 0.85 over the 0.5–2.5 THz frequency band. Moreover, under curved magnetization, ellipticity exceeding 0.6 can be achieved in patterned emitters, where no chiral THz waves are radiated under a uniform magnetic field. Our findings provide the capability to expand the application scenarios of integrated spin-optoelectronic devices, shedding light on potential benefits in wireless communications and biomedical detection.