[1] Mittleman D M. Perspective:terahertz science and technology[J]. Journal of Applied Physics, 122, 230901(2017).

[2] Zhang L, Zhang M, Liang H W. Realization of full control of a terahertz wave using flexible metasurfaces[J]. Advanced Optical Materials, 5, 1700486(2017).

[3] Hu B B, Nuss M C. Imaging with terahertz waves[J]. Optics Letters, 20, 1716-1718(1995).

[4] Mittleman D. Sensing with terahertz radiation[M]. Berlin, Heidelberg: Springer(2003).

[5] Koenig S, Lopez-Diaz D, Antes J et al. Wireless sub-THz communication system with high data rate[J]. Nature Photonics, 7, 977-981(2013).

[6] Karl N J. McKinney R W, Monnai Y, et al. Frequency-division multiplexing in the terahertz range using a leaky-wave antenna[J]. Nature Photonics, 9, 717-720(2015).

[7] Rusina A, Durach M, Nelson K A et al. Nanoconcentration of terahertz radiation in plasmonic waveguides[J]. Optics Express, 16, 18576-18589(2008).

[8] Liang H W, Ruan S C, Zhang M et al. Nanofocusing of terahertz wave on conical metal wire waveguides[J]. Optics Communications, 283, 262-264(2010).

[9] Gao H, Cao Q, Zhu M N et al. Nanofocusing of terahertz wave in a tapered hyperbolic metal waveguide[J]. Optics Express, 22, 32071-32081(2014).

[10] Seo M A, Park H R, Koo S M et al. Terahertz field enhancement by a metallic nano slit operating beyond the skin-depth limit[J]. Nature Photonics, 3, 152-156(2009).

[11] Zhan H, Mendis R, Mittleman D M. Superfocusing terahertz waves below λ/250 using plasmonic parallel-plate waveguides[J]. Optics Express, 18, 9643-9650(2010).

[12] Wang K L, Mittleman D M. Metal wires for terahertz wave guiding[J]. Nature, 432, 376-379(2004).

[13] Awad M M, Cheville R A. Transmission terahertz waveguide-based imaging below the diffraction limit[J]. Applied Physics Letters, 86, 221107(2005).

[14] Wächter M, Nagel M, Kurz H. Metallic slit waveguide for dispersion-free low-loss terahertz signal transmission[J]. Applied Physics Letters, 90, 061111(2007).

[15] Chen D R, Chen H B. A novel low-loss terahertz waveguide: polymer tube[J]. Optics Express, 18, 3762-3767(2010).

[16] Liang H W, Ruan S C, Zhang M. Terahertz surface wave propagation and focusing on conical metal wires[J]. Optics Express, 16, 18241-18248(2008).

[17] Gallot G, Jamison S P. McGowan R W, et al. Terahertz waveguides[J]. Journal of the Optical Society of America B, 17, 851-863(2000).

[18] Wang K, Cao Q, Zhang H F et al. Cos-Gaussian modal field of a terahertz rectangular metal waveguide filled with multiple slices of dielectric[J]. Optics Communications, 417, 57-61(2018).

[19] Mendis R, Mittleman D M. An investigation of the lowest-order transverse-electric (TE1) mode of the parallel-plate waveguide for THz pulse propagation[J]. Journal of the Optical Society of America B, 26, A6-A13(2009).

[20] Kim S H, Lee E S, Ji Y B et al. Improvement of THz coupling using a tapered parallel-plate waveguide[J]. Optics Express, 18, 1289-1295(2010).

[21] Markov A, Guerboukha H, Skorobogatiy M. Hybrid metal wire-dielectric terahertz waveguides: challenges and opportunities [Invited][J]. Journal of the Optical Society of America B, 31, 2587-2600(2014).

[22] Cao Q, Jahns J. Azimuthally polarized surface plasmons as effective terahertz waveguides[J]. Optics Express, 13, 511-518(2005).

[23] He X Y, Wang Q J, Yu S F. Numerical study of gain-assisted terahertz hybrid plasmonic waveguide[J]. Plasmonics, 7, 571-577(2012).

[24] Li H S, Atakaramians S, Lwin R et al. Flexible single-mode hollow-core terahertz fiber with metamaterial cladding[J]. Optica, 3, 941-947(2016).

[25] Atakaramians S, Afshar V S, Monro T M et al. Terahertz dielectric waveguides[J]. Advances in Optics and Photonics, 5, 169-215(2013).

[26] Chen Y, Cao J G, Xu Y M et al. Fano resonance sensing characteristics of metal-dielectric-metal waveguide coupling square cavity with bimetallic baffle[J]. Chinese Journal of Lasers, 46, 0213001(2019).

[27] Mendis R, Grischkowsky D. Undistorted guided-wave propagation of subpicosecond terahertz pulses[J]. Optics Letters, 26, 846-848(2001).

[28] Harsha S S, Laman N, Grischkowsky D. High-Q terahertz Bragg resonances within a metal parallel plate waveguide[J]. Applied Physics Letters, 94, 091118(2009).

[29] Laman N, Harsha S S, Grischkowsky D et al. High-resolution waveguide THz spectroscopy of biological molecules[J]. Biophysical Journal, 94, 1010-1020(2008).

[30] Eyyubo lu H T, Baykal Y. Analysis of reciprocity of cos-Gaussian and cosh-Gaussian laser beams in a turbulent atmosphere[J]. Optics Express, 12, 4659-4674(2004).

[31] Zhou G Q, Chu X X. Propagation of a partially coherent cosine-Gaussian beam through an ABCD optical system in turbulent atmosphere[J]. Optics Express, 17, 10529-10534(2009).

[32] Huang Y C, Cai D F, Zhang T R. Beam waist width and waist location of cosh-Gaussian beams in a gradient-index medium[J]. Laser & Optoelectronics Progress, 52, 022601(2015).

[33] Yang Y T, Zhang T R, Gong X. Propagation of cosine-Gaussian beams in spherically aberrated fractional Fourier transform system[J]. Acta Optica Sinica, 37, 0207001(2017).

[34] Zhu S J, Chen Y H, Wang J et al. Generation and propagation of a vector cosine-Gaussian correlated beam with radial polarization[J]. Optics Express, 23, 33099-33115(2015).

[35] Chen R P, Ni Y Z, Chu X X. Propagation of a cos-Gaussian beam in a Kerr medium[J]. Optics & Laser Technology, 43, 483-487(2011).

[36] Keshavarz A. Propagation of cos-Gaussian beam in photorefractive crystal[J]. World Academy of Science, Engineering and Technology, 9, 742-745(2015).

[37] Pozar D M. Microwave engineering[M]. Hoboken: John Wiley & Sons(2009).

[38] Kogelnik H, Li T. Laser beams and resonators[J]. Applied Optics, 5, 1550-1567(1966).

[39] Cao Q, Deng X M. Corrections to the paraxial approximation of an arbitrary free-propagation beam[J]. Journal of the Optical Society of America A, 15, 1144-1148(1998).

[40] Ordal M A, Bell R J, Alexander R W et al. Optical properties of fourteen metals in the infrared and far infrared: Al, Co, Cu, Au, Fe, Pb, Mo, Ni, Pd, Pt, Ag, Ti, V, and W[J]. Applied Optics, 24, 4493-4499(1985).