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Acta Optica Sinica, Volume. 45, Issue 8, 0828002(2025)

Design of Chiral Metasurface Sensor with Stabilized Strong Circular Dichroism

Fengfeng Liang1, Xiuhong Liu1,2,3、*, Zhi Zhao1,2,3, Haiyan Han1,2,3, Sixing Xi1,2,3, and Jinhua Hu4、**
Author Affiliations
  • 1School of Mathematics and Physics, Hebei University of Engineering, Handan 056038, Hebei, China
  • 2Hebei Computational Optical Imaging and Photoelectric Detection Technology Innovation Center, Handan 056038, Hebei, China
  • 3Hebei International Joint Research Center for Computational Optical Imaging and Intelligent Sensing, Handan 056038, Hebei, China
  • 4School of Information & Electrical Engineering, Hebei University of Engineering, Handan 056038, Hebei, China
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    Figures & Tables(10)
    Schematic of inverse-S chiral metasurface. (a) Schematic of inverse-S chiral metasurface illuminated by circular polarized light; (b) top view of the unit cell; (c) front view of the unit cell

    Fig. 1. Schematic of inverse-S chiral metasurface. (a) Schematic of inverse-S chiral metasurface illuminated by circular polarized light; (b) top view of the unit cell; (c) front view of the unit cell

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    Eigenmode analysis of chiral metasurface. (a) Band structure of the eigenmodes, and the inset indicates the schematic of the first Brillouin zone; (b) Q-factors of two eigenmodes; (c) electric field distribution of SP-BIC at the plane of z=h/2; eigenpolarization of mode 2 in the first Brillouin zone with (d) α=0°, (e) α=10°, and (f) α=40°, where polarization states are represented by ellipses

    Fig. 2. Eigenmode analysis of chiral metasurface. (a) Band structure of the eigenmodes, and the inset indicates the schematic of the first Brillouin zone; (b) Q-factors of two eigenmodes; (c) electric field distribution of SP-BIC at the plane of z=h/2; eigenpolarization of mode 2 in the first Brillouin zone with (d) α=0°, (e) α=10°, and (f) α=40°, where polarization states are represented by ellipses

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    Chiral response analysis of metasurface when in-plane C2 symmetry is broken. (a) Transmission Jones matrix spectra and CD spectra at α=5°; (b) CD spectra of metasurface under different α; (c) relationship between Q-factor and structural asymmetry parameter δ

    Fig. 3. Chiral response analysis of metasurface when in-plane C2 symmetry is broken. (a) Transmission Jones matrix spectra and CD spectra at α=5°; (b) CD spectra of metasurface under different α; (c) relationship between Q-factor and structural asymmetry parameter δ

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    Far-field scattering power and near-field distribution of the chiral metasurface at α=5°. (a)(b) Scattering power of multipoles under LCP and RCP light incidence; (c)(d) electric field distribution under LCP and RCP light incidence, and the arrows represent the magnetic field vector

    Fig. 4. Far-field scattering power and near-field distribution of the chiral metasurface at α=5°. (a)(b) Scattering power of multipoles under LCP and RCP light incidence; (c)(d) electric field distribution under LCP and RCP light incidence, and the arrows represent the magnetic field vector

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    CD spectra for different structural parameters. (a) h; (b) r1; (c) Px; (d) Py

    Fig. 5. CD spectra for different structural parameters. (a) h; (b) r1; (c) Px; (d) Py

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    Curves of CD maximum and derivative for different structural parameters. (a) h; (b) r1; (c) Px; (d) Py

    Fig. 6. Curves of CD maximum and derivative for different structural parameters. (a) h; (b) r1; (c) Px; (d) Py

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    Far-field scattering power of multipoles at different h. (a)(d) Multipole contributions of LCP and RCP light incidence at h=355 nm; (b)(e) multipole contributions of LCP and RCP light incidence at h=365 nm; (c)(f) multipole contributions of LCP and RCP light incidence at h=375 nm

    Fig. 7. Far-field scattering power of multipoles at different h. (a)(d) Multipole contributions of LCP and RCP light incidence at h=355 nm; (b)(e) multipole contributions of LCP and RCP light incidence at h=365 nm; (c)(f) multipole contributions of LCP and RCP light incidence at h=375 nm

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    CD spectra and resonance peak positions under different refractive indices. (a) Simulated CD spectra; (b) resonance peak positions

    Fig. 8. CD spectra and resonance peak positions under different refractive indices. (a) Simulated CD spectra; (b) resonance peak positions

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    Local enhancement of optical chirality and CD spectra of different chiral enantiomers. (a) Local enhancement of optical chirality at k=0, and the inset indicates spatial distribution of C/C0 at the plane of z=0; (b) CD spectra of different chiral enantiomers

    Fig. 9. Local enhancement of optical chirality and CD spectra of different chiral enantiomers. (a) Local enhancement of optical chirality at k=0, and the inset indicates spatial distribution of C/C0 at the plane of z=0; (b) CD spectra of different chiral enantiomers

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    • Table 1. Comparison of refractive index sensing performance of different chiral metasurface sensors

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      Table 1. Comparison of refractive index sensing performance of different chiral metasurface sensors

      Ref.S /（nm∙RIU-1）ηFOM /RIU-1

      Peak value

      of CD

      ［31］69.311550.78
      ［32］1001000.75
      ［33］47.91630.92
      ［16］233‒0.99
      ［17］136.211350.94
      This work375.8612453.940.96
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    Fengfeng Liang, Xiuhong Liu, Zhi Zhao, Haiyan Han, Sixing Xi, Jinhua Hu. Design of Chiral Metasurface Sensor with Stabilized Strong Circular Dichroism[J]. Acta Optica Sinica, 2025, 45(8): 0828002

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    Paper Information

    Category: Remote Sensing and Sensors

    Received: Dec. 12, 2024

    Accepted: Feb. 18, 2025

    Published Online: Apr. 27, 2025

    The Author Email: Xiuhong Liu (liuxiuhong@hebeu.edu.cn), Jinhua Hu (hujh84@hebeu.edu.cn)

    DOI:10.3788/AOS241886

    CSTR:32393.14.AOS241886

    Topics

    laser devices and laser physics
    Lasers and Laser Optics
    Laser physics
    laser manufacturing
    Instrumentation, Measurement and Metrology