[1] Tian L, Jin W Q, Cai Y et al. Imaging area and contrast of THz focal plane array CW transmission imaging system[J]. Optics and Precision Engineering, 23, 2164-2170(2015).

[2] Li C Y, Yang Z, Zhou Q L et al. Influence of structures on optical modulation in terahertz metamaterials[J]. Infrared and Laser Engineering, 45, 0703002(2016).

[3] Meng K, Li Z R, Liu Q. Aging explosive detection using terahertz time-domain spectroscopy[J]. Spectroscopy and Spectral Analysis, 31, 1305-1308(2011).

[4] Hua Y F, Zhang H J. Qualitative and quantitative detection of pesticides with terahertz time-domain spectroscopy[J]. IEEE Transactions on Microwave Theory and Techniques, 58, 2064-2070(2010).

[5] Cao B H, Hou D B, Yan Z G et al. Method for detection of pesticide residue based on terahertz time domain spectroscopy[J]. Journal of Infrared and Millimeter Waves, 27, 429-432(2008).

[6] Zhu L, Zhang G X, Cao B H et al. Terahertz spectrum of Sudan I[J]. Chinese Journal of Sensors and Actuators, 21, 83-87(2008).

[7] Meng Q P. Pharmacological study on adverse reactions caused by amoxicillin[J]. China Practical Medicine, 7, 152-153(2012).

[8] Wang K L, Li J W. The identification and analysis of several western medicines using Fourier transform infrared spectroscopy[J]. The Journal of Light Scattering, 26, 78-83(2014).

[9] Feng H D, Li T T, Zhang H et al. Qualitative study of NIRS in identification of amoxicillin granules from different manufacturers[J]. Food and Drug, 19, 318-322(2017).

[10] Yu G L. Application of terahertz time-domain spectroscopy[D]. Tianjin: Nankai University(2014).

[11] Guo L J. Terahertz time-domain spectroscopy system and imaging application[D]. Tianjin: Nankai University(2015).

[12] Duvillaret L, Garet F, Coutaz J L. A reliable method for extraction of material parameters in terahertz time-domain spectroscopy[J]. IEEE Journal of Selected Topics in Quantum Electronics, 2, 739-746(1996).

[13] Duvillaret L, Garet F, Coutaz J L. Highly precise determination of optical constants and sample thickness in terahertz time-domain spectroscopy[J]. Applied Optics, 38, 409(1999).

[14] Dai Z J, Su Q, Lu D et al. A combined experimental and theoretical study on the terahertz vibrations of water vapors[J]. Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 214, 277-284(2019).

[15] Lu T, Chen F W. Multiwfn: a multifunctional wavefunction analyzer[J]. Journal of Computational Chemistry, 33, 580-592(2012).