[1] Y PENG, C SHI, Y ZHU et al. Terahertz spectroscopy in biomedical field: a review on signal-to-noise ratio improvement. PhotoniX, 1-18(2020).

[2] Shutao YANG, Miao YU, Mengting ZHANG et al. Terahertz ptychography system using Gaussian beam as probe. Journal of Applied Optics, 42, 571-576(2021).

[3] M WAN, J J HEALY, J T SHERIDAN. Terahertz phase imaging and biomedical applications. Optics & Laser Technology, 122, 105859(2020).

[4] Z WAN, Z GAO, F GAO et al. Terahertz massive MIMO with holographic reconfigurable intelligent surfaces. IEEE Transactions on Communications, 69, 4732-4750(2021).

[5] Hongru YANG, Hongguang LI. Research progress on terahertz communication technology. Journal of Applied Optics, 39, 12-21(2018).

[6] Z CHEN, X MA, B ZHANG et al. A survey on terahertz communications. China Communications, 16, 1-35(2019).

[7] L ALLEN, M W BEIJERSBERGEN, R J C SPREEUW et al. Orbital angular momentum of light and the transformation of Laguerre-Gaussian laser modes. Physical Review A, 45, 8185(1992).

[8] R A HERRING. A new twist for electron beams. Science, 331, 155-156(2011).

[9] T YANG, H SHI, J GUO et al. Orbital-angular-momentum-based super-resolution ISAR imaging for maneuvering targets: modeling and performance analysis. Digital Signal Processing, 117, 103197(2021).

[10] L GONG, Q ZHAO, H ZHANG et al. Optical orbital-angular-momentum-multiplexed data transmission under high scattering. Light:Science & Applications, 8, 27(2019).

[11] J WU, Z HUANG, X REN et al. Wideband millimeter-wave dual-mode dual circularly polarized OAM antenna using sequentially rotated feeding technique. IEEE Antennas and Wireless Propagation Letters, 19, 1296-1300(2020).

[12] Y CHEN, S ZHENG, Y LI et al. A flat-lensed spiral phase plate based on phase-shifting surface for generation of millimeter-wave OAM beam. IEEE Antennas and Wireless Propagation Letters, 15, 1156-1158(2015).

[13] Sheng SUN, Lingjun YANG, Wei SHA. Offset-fed vortex wave generator based on reflective metasurface. Acta Physica Sinica, 70, 263-269(2021).

[14] Junpeng FAN, Xiaozhao WANG, Jianxin ZHANG et al. Optically switchable multifunctional terahertz geometric phase metasurface. Journal of Applied Optics, 43, 986-993(2022).

[15] N YU, P GENEVET, M A KATS et al. Light propagation with phase discontinuities: generalized laws of reflection and refraction. Science, 334, 333-337(2011).

[16] Z CHANG, B YOU, L S WU et al. A reconfigurable graphene reflectarray for generation of vortex THz waves. IEEE Antennas and Wireless Propagation Letters, 15, 1537-1540(2016).

[17] Y SHI, Y ZHANG. Generation of wideband tunable orbital angular momentum vortex waves using graphene metamaterial reflectarray. IEEE Access, 6, 5341-5347(2017).

[18] Xiaonan LI, Lu ZHOU, Guozhong ZHAO. Terahertz vortex beam generation based on reflective metasurface. Acta Physica Sinica, 68, 285-291(2019).

[19] Min ZHONG, Jiusheng LI. Switchable frequency terahertz vortex beam generator. Acta Physica Sinica, 71, 340-348(2022).

[20] Jiaoyan GUO, Wenyu LI, Ran SUN et al. Generation of broadband terahertz vortex beam based on double-arrow metasurface. Chinese Journal of Lasers, 48, 194-200(2021).

[21] J S LI, L N ZHANG. Simple terahertz vortex beam generator based on reflective metasurfaces. Optics Express, 28, 36403-36412(2020).

[22] Wenjing FENG, Hao TANG, Jida WU et al. Research on vortex beam generation based on terahertz broadband metasurface. Laser Journal, 40, 56-59(2019).