[4] [4] Sun J D. High-responsivity room-temperature self-mixing terahertz detectors based on high-electron-mobility field-effect transistor[D]. Suzhou: Suzhou Institute of Nano-tech and Nano-Bionics, Chinese Academy of Sciences, 2012.

[6] [6] Li X. Research on field coupling mechanism and structure of field-effect terahertz self-mixing detectors[D]. Hefei: University of Science and Technology of China, 2018.

[16] [16] Chen H T, Chang C C, Huang L. Bi-Layer metasurfaces for dual and broadband terahertz antireflection[C]//2017 42nd International Conference on Infrared, Millimeter and Terahertz Waves(IRMMW-THz). Cancun, Mexico: IEEE, 2017: 1.

[22] [22] Yariv A, Yeh P. Optical Electronics in Modern Communications[M]. 6th ed. Beijing: Publishing House of Electronics Industry, 2009.

[24] [24] Zhang H X, Shen Y M, Han Y N. Field and Wave Electromagnetics[M]. Beijing: Tsinghua University Press, 2013.

[29] [29] MacLeod H A. Thin-Film Optical Filters[M]. 4th ed. Boca Raton: CRC Press, 2010.

[32] [32] Wu L B. Research on coupling technology of laser and fiber[D]. Wuhan: Huazhong University of Science and Technology, 2006.

[37] [37] Zeng D J. Analysis of focal effect of metasurfaces based on dielectric nanobrick by simulation[D]. Chongqing: Chongqing University, 2016.