• Chinese Optics Letters
  • Vol. 23, Issue 1, 013602 (2025)
Guangfan Liu1, Shuai Deng1, Sen Hong1, Qiongxiong Ma2,*..., Chengping Yin1,3,** and Kunyuan Xu1,3,***|Show fewer author(s)
Author Affiliations
  • 1Key Laboratory of Atomic and Subatomic Structure and Quantum Control (Ministry of Education), Guangdong Basic Research Center of Excellence for Structure and Fundamental Interactions of Matter, School of Physics, South China Normal University, Guangzhou 510006, China
  • 2Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices, South China Normal University, Guangzhou 510006, China
  • 3Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, Guangdong-Hong Kong Joint Laboratory of Quantum Matter, South China Normal University, Guangzhou 510006, China
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    DOI: 10.3788/COL202523.013602 Cite this Article Set citation alerts
    Guangfan Liu, Shuai Deng, Sen Hong, Qiongxiong Ma, Chengping Yin, Kunyuan Xu, "Dynamical tuning multifunctional and nonreciprocal polarization conversion by twisting twin Weyl-semimetal layers," Chin. Opt. Lett. 23, 013602 (2025) Copy Citation Text show less
    Diagram of proposed structure with (a) sandwich structure composed of two layers of WSM separated by a dielectric layer and (b) wavelength dispersions of permittivity and effective permittivity.
    Fig. 1. Diagram of proposed structure with (a) sandwich structure composed of two layers of WSM separated by a dielectric layer and (b) wavelength dispersions of permittivity and effective permittivity.
    Contours of the transmittance of the proposed structure as a function of twist angle and wavelength. (a) and (b) represent the transmittance of light from TM to TE polarization in the forward and backward incidence, respectively. (c) and (d) represent the transmittance of light from TM to TM polarization in the forward and backward incidence, respectively.
    Fig. 2. Contours of the transmittance of the proposed structure as a function of twist angle and wavelength. (a) and (b) represent the transmittance of light from TM to TE polarization in the forward and backward incidence, respectively. (c) and (d) represent the transmittance of light from TM to TM polarization in the forward and backward incidence, respectively.
    Contours of the ellipticity as a function of twist angle and wavelength. (a) is for the forward incidence, and (b) is for the backward incidence. (c) The relationship between the twist angle and ellipticity for forward (blue line) and backward (red line) incidences at the wavelength of 5.36 µm.
    Fig. 3. Contours of the ellipticity as a function of twist angle and wavelength. (a) is for the forward incidence, and (b) is for the backward incidence. (c) The relationship between the twist angle and ellipticity for forward (blue line) and backward (red line) incidences at the wavelength of 5.36 µm.
    Contours of the transmittance and reflectance as a function of incident angle and wavelength. In (a) and (b), the transmittance and reflectance of an incident TE-polarized light on the nonrotating single-layer WSM are represented, respectively. Similarly, in (c) and (d), the transmittance and reflectance of an incident TM-polarized light are represented.
    Fig. 4. Contours of the transmittance and reflectance as a function of incident angle and wavelength. In (a) and (b), the transmittance and reflectance of an incident TE-polarized light on the nonrotating single-layer WSM are represented, respectively. Similarly, in (c) and (d), the transmittance and reflectance of an incident TM-polarized light are represented.
    Explanations of unidirectional conversion between (a) orthogonal linear polarizations and (b) nonreciprocal conversion of light from linear to elliptical polarization.
    Fig. 5. Explanations of unidirectional conversion between (a) orthogonal linear polarizations and (b) nonreciprocal conversion of light from linear to elliptical polarization.
    Contours of the transmittance of the proposed structure as a function of incident angle and wavelength, in which twist angle φ = 120°. (a) and (b) represent the transmittance of TM-to-TE polarization light in the forward and backward cases, respectively.
    Fig. 6. Contours of the transmittance of the proposed structure as a function of incident angle and wavelength, in which twist angle φ = 120°. (a) and (b) represent the transmittance of TM-to-TE polarization light in the forward and backward cases, respectively.
    Contours of the polarization conversion rate as a function of incident angle and wavelength, in which twist angle φ = 120°. (a) is for the forward incidence and (b) is for the backward incidence. (c) Isolation loss and insertion loss as a function of wavelength.
    Fig. 7. Contours of the polarization conversion rate as a function of incident angle and wavelength, in which twist angle φ = 120°. (a) is for the forward incidence and (b) is for the backward incidence. (c) Isolation loss and insertion loss as a function of wavelength.
     PCRISO (dB)Band range (μm)Thickness
    Conventional optical components[30]>90%10–300.4–0.6About 1 cm
    Ours>95%20–1004.1–4.52 µm
    Table 1. Comparison of the Performance of Various Optical Polarization Converters
    Guangfan Liu, Shuai Deng, Sen Hong, Qiongxiong Ma, Chengping Yin, Kunyuan Xu, "Dynamical tuning multifunctional and nonreciprocal polarization conversion by twisting twin Weyl-semimetal layers," Chin. Opt. Lett. 23, 013602 (2025)
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