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Angle-Dependent Terahertz Circular Dichroism and Full-Space Polarization Manipulation via Extrinsic Chiral Metasurfaces.

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Title: Angle-Dependent Terahertz Circular Dichroism and Full-Space Polarization Manipulation via Extrinsic Chiral Metasurfaces.
Authors: Wan, Mengxiang1,2 (AUTHOR), Shen, Jiahao1,2 (AUTHOR), Xu, Hang3 (AUTHOR), Ding, Jialuo1,2 (AUTHOR), Chen, Cheng1,2 (AUTHOR), Dong, Qi1,2,3 (AUTHOR), Lv, Yuanyuan1,2 (AUTHOR), Liu, Lin1,2 (AUTHOR), Luo, Li1,2 (AUTHOR), Tang, Tingting1,2 (AUTHOR), Li, Jie1,2 (AUTHOR) li_jie_d@tju.edu.cn, Yao, Jianquan3 (AUTHOR)
Source: Nanomaterials (2079-4991). May2026, Vol. 16 Issue 10, p595. 10p.
Subjects: Circular dichroism, Polarization (Electricity), Brewster's angle, Submillimeter wave imaging, Scattering (Physics)
Abstract: Extrinsic chiral metasurfaces offer a promising route for controlling chiroptical responses through incident angle variation, yet the simultaneous realization of strong circular dichroism and full-space polarization beam splitting remains challenging. In this work, we propose an all-dielectric extrinsic chiral metasurface that leverages obliquely incident terahertz waves to break in-plane symmetry, thereby activating out-of-plane multipoles and inducing strong spin-selective scattering. At an incident angle of 30°, the metasurface achieves efficient full-space separation of left- and right-handed circularly polarized waves, with a circular dichroism peak exceeding 0.7 near 0.48 THz. Moreover, by varying the incident angle or operating frequency, the polarization state of the reflected wave can be continuously tuned from linear to elliptical to nearly circular, as visualized on the Poincaré sphere. This angle-dependent, full-space polarization manipulation capability highlights the potential of the proposed metasurface for applications in advanced terahertz imaging, LiDAR, and integrated photonic 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: Angle-Dependent Terahertz Circular Dichroism and Full-Space Polarization Manipulation via Extrinsic Chiral Metasurfaces.
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  Data: Extrinsic chiral metasurfaces offer a promising route for controlling chiroptical responses through incident angle variation, yet the simultaneous realization of strong circular dichroism and full-space polarization beam splitting remains challenging. In this work, we propose an all-dielectric extrinsic chiral metasurface that leverages obliquely incident terahertz waves to break in-plane symmetry, thereby activating out-of-plane multipoles and inducing strong spin-selective scattering. At an incident angle of 30°, the metasurface achieves efficient full-space separation of left- and right-handed circularly polarized waves, with a circular dichroism peak exceeding 0.7 near 0.48 THz. Moreover, by varying the incident angle or operating frequency, the polarization state of the reflected wave can be continuously tuned from linear to elliptical to nearly circular, as visualized on the Poincaré sphere. This angle-dependent, full-space polarization manipulation capability highlights the potential of the proposed metasurface for applications in advanced terahertz imaging, LiDAR, and integrated photonic systems. [ABSTRACT FROM AUTHOR]
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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/nano16100595
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        Text: English
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        PageCount: 10
        StartPage: 595
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      – SubjectFull: Circular dichroism
        Type: general
      – SubjectFull: Polarization (Electricity)
        Type: general
      – SubjectFull: Brewster's angle
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      – SubjectFull: Submillimeter wave imaging
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              Text: May2026
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