• Photonics Research
  • Vol. 9, Issue 10, 1939 (2021)
Jie Li1, Chenglong Zheng1, Jitao Li1, Guocui Wang2、3, Jingyu Liu2, Zhen Yue1, Xuanruo Hao1, Yue Yang1, Fuyu Li4, Tingting Tang4, Yating Zhang1、5、*, Yan Zhang2、6、*, and Jianquan Yao1、7、*
Author Affiliations
  • 1Key Laboratory of Opto-Electronics Information Technology (Tianjin University), Ministry of Education, School of Precision Instruments and Opto-Electronics Engineering, Tianjin University, Tianjin 300072, China
  • 2Beijing Key Laboratory for Metamaterials and Devices, Key Laboratory of Terahertz Optoelectronics, Ministry of Education, and Beijing Advanced Innovation Center for Imaging Technology, Department of Physics, Capital Normal University, Beijing 100048, China
  • 3Beijing Engineering Research Center for Mixed Reality and Advanced Display, School of Optics and Photonics, Beijing Institute of Technology, Beijing 100081, China
  • 4Information Materials and Device Applications Key Laboratory of Sichuan Provincial Universities, Chengdu University of Information Technology, Chengdu 610225, China
  • 5e-mail: yating@tju.edu.cn
  • 6e-mail: yzhang@mail.cnu.edu.cn
  • 7e-mail: jqyao@tju.edu.cn
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    DOI: 10.1364/PRJ.431019 Cite this Article Set citation alerts
    Jie Li, Chenglong Zheng, Jitao Li, Guocui Wang, Jingyu Liu, Zhen Yue, Xuanruo Hao, Yue Yang, Fuyu Li, Tingting Tang, Yating Zhang, Yan Zhang, Jianquan Yao. Terahertz wavefront shaping with multi-channel polarization conversion based on all-dielectric metasurface[J]. Photonics Research, 2021, 9(10): 1939 Copy Citation Text show less
    Schematic diagram of the metasurface for beam shaping with dual-channel polarization conversion. (a) Taking the orthogonal linearly polarized terahertz waves as an example, a 45° polarized (a-polarized) or right circularly polarized (RCP) beam can be obtained when the x- or y-polarized wave is incident, respectively. (b) The arrangement of two types of meta-atoms in the metasurface. The eigen-polarizations for the first and second types of meta-atoms are x (y) polarization and ±45°(a,b) polarizations, respectively.
    Fig. 1. Schematic diagram of the metasurface for beam shaping with dual-channel polarization conversion. (a) Taking the orthogonal linearly polarized terahertz waves as an example, a 45° polarized (a-polarized) or right circularly polarized (RCP) beam can be obtained when the x- or y-polarized wave is incident, respectively. (b) The arrangement of two types of meta-atoms in the metasurface. The eigen-polarizations for the first and second types of meta-atoms are x(y) polarization and ±45°(a,b) polarizations, respectively.
    Amplitudes and phases of the transmitted wave corresponding to meta-atoms with selected geometric parameters. (a) Geometric shape of the two kinds of meta-atoms. Amplitude and phase values for the (b) second and (c)–(f) first types of meta-atoms.
    Fig. 2. Amplitudes and phases of the transmitted wave corresponding to meta-atoms with selected geometric parameters. (a) Geometric shape of the two kinds of meta-atoms. Amplitude and phase values for the (b) second and (c)–(f) first types of meta-atoms.
    Simulated and experimental results of sample 1 for the generation of focused vortex beam with polarization conversion. (a) SEM images of sample 1. (b) Demonstration of dual-channel polarization conversion on the Poincaré sphere. (c) Electric field intensity of the transmitted wave in the focal plane when the x- or y-polarized beam is incident. (d) Electric field intensity in the longitudinal section (xoz-plane) at different frequencies. (e) The simulated and measured polarization conversion efficiency of the metasurface in the range of 0.7–1.4 THz at the focal plane, in which the designed working frequency is 1.1 THz.
    Fig. 3. Simulated and experimental results of sample 1 for the generation of focused vortex beam with polarization conversion. (a) SEM images of sample 1. (b) Demonstration of dual-channel polarization conversion on the Poincaré sphere. (c) Electric field intensity of the transmitted wave in the focal plane when the x- or y-polarized beam is incident. (d) Electric field intensity in the longitudinal section (xoz-plane) at different frequencies. (e) The simulated and measured polarization conversion efficiency of the metasurface in the range of 0.7–1.4 THz at the focal plane, in which the designed working frequency is 1.1 THz.
    Simulated and experimental results of sample 2 for the generation of focused vortex beam with polarization conversion. (a) SEM image and optical photo of sample 2. (b) Demonstration of the dual-channel polarization conversion on the Poincaré sphere. (c) Electric field intensity of the transmitted wave when the x- or y-polarized beam is incident. (d), (e) Electric field intensity in the longitudinal section (xoz-plane) for different polarization components, and values of S3 component of the Stokes parameters.
    Fig. 4. Simulated and experimental results of sample 2 for the generation of focused vortex beam with polarization conversion. (a) SEM image and optical photo of sample 2. (b) Demonstration of the dual-channel polarization conversion on the Poincaré sphere. (c) Electric field intensity of the transmitted wave when the x- or y-polarized beam is incident. (d), (e) Electric field intensity in the longitudinal section (xoz-plane) for different polarization components, and values of S3 component of the Stokes parameters.
    General discussions on the available polarization states. (a), (b) The possible polarization realization of the transmitted wave when the linearly polarized wave is incident. (c) Transmitted electric field intensities under circularly polarized wave illumination.
    Fig. 5. General discussions on the available polarization states. (a), (b) The possible polarization realization of the transmitted wave when the linearly polarized wave is incident. (c) Transmitted electric field intensities under circularly polarized wave illumination.
    Transmission amplitudes and phases of the meta-atoms with different geometric sizes.
    Fig. 6. Transmission amplitudes and phases of the meta-atoms with different geometric sizes.
    Near-field phase distributions of the two samples.
    Fig. 7. Near-field phase distributions of the two samples.
    Phase distributions in the focal plane of the generated vortex beam from sample 1.
    Fig. 8. Phase distributions in the focal plane of the generated vortex beam from sample 1.
    THz imaging system based on two-dimensional electro-optical sampling.
    Fig. 9. THz imaging system based on two-dimensional electro-optical sampling.
    Jie Li, Chenglong Zheng, Jitao Li, Guocui Wang, Jingyu Liu, Zhen Yue, Xuanruo Hao, Yue Yang, Fuyu Li, Tingting Tang, Yating Zhang, Yan Zhang, Jianquan Yao. Terahertz wavefront shaping with multi-channel polarization conversion based on all-dielectric metasurface[J]. Photonics Research, 2021, 9(10): 1939
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