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Tunable Chiral Terahertz Wave Absorption and Beam Manipulation Based on Vanadium Dioxide Metasurfaces.

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Title: Tunable Chiral Terahertz Wave Absorption and Beam Manipulation Based on Vanadium Dioxide Metasurfaces.
Authors: Luo, Li1,2 (AUTHOR), Chen, Boyu1,2 (AUTHOR), Li, Jie1,2,3 (AUTHOR) li_jie_d@tju.edu.cn, Zheng, Yi3,4 (AUTHOR), He, Jin1,2,5 (AUTHOR), Lv, Yuanyuan1,2 (AUTHOR), Liu, Lin1,2 (AUTHOR), Chen, Cheng1,2,3 (AUTHOR), Ding, Jialuo1,2,4 (AUTHOR), Yan, Xiang4,5 (AUTHOR), Chen, Junqi4 (AUTHOR), Tian, Tian4 (AUTHOR), Zhao, Zhe1,2 (AUTHOR), Lin, Zhanyi1,2 (AUTHOR), Chen, Menghan1,2 (AUTHOR), Liang, Lin1,2 (AUTHOR), Yao, Jianquan5 (AUTHOR)
Source: Nanomaterials (2079-4991). Feb2026, Vol. 16 Issue 3, p189. 13p.
Subjects: Vanadium dioxide, Circular dichroism, Geometric quantum phases, Beam steering, Photonics, Phase change materials, Submillimeter waves
Abstract: Chiral metasurfaces exhibit enormous potential in optical applications, and their integration with phase-change material vanadium dioxide (VO2) provides a novel pathway for dynamic regulation. In this study, a chiral absorptive metasurface based on VO2 is designed. By tuning the VO2 conductivity around the operating frequency of 2.81 THz, the circular dichroism (CD) can be continuously adjusted from 0.06 to 0.95, realizing a high-contrast chiral switch. On this basis, the Pancharatnam–Berry (PB) phase is introduced to construct a chirality-dependent phase gradient: when the VO2 conductivity is 200,000 S/m, only the left-handed circularly polarized (LCP) wave is subjected to periodic phase modulation, enabling controllable deflection of the reflected beam, while the right-handed circularly polarized (RCP) wave is selectively absorbed. This "chiral phase encoding" strategy simultaneously achieves absorptive CD tuning and reflective beam shaping on a single metasurface, significantly enhancing the flexible manipulation capability of circular polarization states in the terahertz band. It provides a compact and efficient solution for reconfigurable imaging, unidirectional communication, and integrated photonics systems. [ABSTRACT FROM AUTHOR]
Copyright of Nanomaterials (2079-4991) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Tunable Chiral Terahertz Wave Absorption and Beam Manipulation Based on Vanadium Dioxide Metasurfaces.
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  Data: <searchLink fieldCode="JN" term="%22Nanomaterials+%282079-4991%29%22">Nanomaterials (2079-4991)</searchLink>. Feb2026, Vol. 16 Issue 3, p189. 13p.
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  Data: <searchLink fieldCode="DE" term="%22Vanadium+dioxide%22">Vanadium dioxide</searchLink><br /><searchLink fieldCode="DE" term="%22Circular+dichroism%22">Circular dichroism</searchLink><br /><searchLink fieldCode="DE" term="%22Geometric+quantum+phases%22">Geometric quantum phases</searchLink><br /><searchLink fieldCode="DE" term="%22Beam+steering%22">Beam steering</searchLink><br /><searchLink fieldCode="DE" term="%22Photonics%22">Photonics</searchLink><br /><searchLink fieldCode="DE" term="%22Phase+change+materials%22">Phase change materials</searchLink><br /><searchLink fieldCode="DE" term="%22Submillimeter+waves%22">Submillimeter waves</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Chiral metasurfaces exhibit enormous potential in optical applications, and their integration with phase-change material vanadium dioxide (VO2) provides a novel pathway for dynamic regulation. In this study, a chiral absorptive metasurface based on VO2 is designed. By tuning the VO2 conductivity around the operating frequency of 2.81 THz, the circular dichroism (CD) can be continuously adjusted from 0.06 to 0.95, realizing a high-contrast chiral switch. On this basis, the Pancharatnam–Berry (PB) phase is introduced to construct a chirality-dependent phase gradient: when the VO2 conductivity is 200,000 S/m, only the left-handed circularly polarized (LCP) wave is subjected to periodic phase modulation, enabling controllable deflection of the reflected beam, while the right-handed circularly polarized (RCP) wave is selectively absorbed. This "chiral phase encoding" strategy simultaneously achieves absorptive CD tuning and reflective beam shaping on a single metasurface, significantly enhancing the flexible manipulation capability of circular polarization states in the terahertz band. It provides a compact and efficient solution for reconfigurable imaging, unidirectional communication, and integrated photonics systems. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
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  Data: <i>Copyright of Nanomaterials (2079-4991) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.3390/nano16030189
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        Text: English
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        PageCount: 13
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      – SubjectFull: Vanadium dioxide
        Type: general
      – SubjectFull: Circular dichroism
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      – SubjectFull: Geometric quantum phases
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      – SubjectFull: Submillimeter waves
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      – TitleFull: Tunable Chiral Terahertz Wave Absorption and Beam Manipulation Based on Vanadium Dioxide Metasurfaces.
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