[1] Udem Th, Holzwarth R, Hnsch T W. Optical frequency metrology[J]. Nature, 2002, 416（6877）: 233-237.
[2] Pernot G, Stoffel M, Savic I, et al. Precise control of thermal conductivity at the nanoscale through individual phonon-scattering barriers[J]. Nature Material, 2010, 9（6）: 491-495.
[3] Dietz R J B, Globisch B, Gerhard M, et al. 64 W pulsed terahertz emission from growth optimized InGaAs/InAlAs heterostructures with separated photoconductive and trapping regions[J]. Applied Physics Letters, 2013, 103（6）: 061103.
[4] Hnsel W, Hoogland H, Giunta M, et al. All polarization maintaining fiber laser architecture for robust femtosecond pulse generation[J]. Applied Physics B, 2017, 123（1）: 41.
[5] Huber A J, Keilmann F, Wittborn J, et al. Terahertz near-field nanoscopy of mobile carriers in single semiconductor nanodevices[J]. Nano Letters, 2008, 8(11): 3766-3770.
[6] Aghmiri N A, Huth F, Huber A J, et al. Hyperspectral time-domain terahertz nanoimaging[J]. Optics Express, 2019, 27(17): 24231-24242.
[7] Krimi S, Klier J, Jonuscheit J, et al. Highly accurate thickness measurement of multi-layered automotive paints using terahertz technology[J]. Applied Physics Letters, 2016, 109（2）: 021105.
[8] Zou P, Peters O, Gleichweit C, et al. THz hyperspectral images analyzed by multivariate statistical methods[C]. Changsha: 9th International Symposium on Ultrafast Phenomena and Terahertz Waves, 2018.
[9] Rosenband T, Hume D B, Schmidt P O, et al. Frequency ratio of Al+ and Hg+ single-on optical clocks metrology at the 17th decimal place[J]. Science, 2008, 319(5781): 1808-1812.
[10] Adler F, Thorpe M J, Cossel K C, et al. Cavity-enhanced direct frequency comb spectroscopy: technology and applications[J]. Reviews in Analytical Chemistry, 2010, 3: 175-205.
[11] Yasuia T, Kabetani Y, Saneyoshi E, et al. Tera hertz frequency comb by multifrequency-heterody ning photoconductive detection for high-accuracy, high-resolution terahertz spectroscopy[J]. Applied Physics Letters, 2006, 88（24）: 241104.
[12] Hsieh Y, Iyonaga Y, Sakaguch Y, et al. Spectrally interleaved, comb-mode-resolved spectroscopy using swept dual terahertz combs[J]. Scientific Reports, 2014, 4: 3816.
[13] Gordon I E, Rothman L S, Hill C, et al. The HITRAN2016 molecular spectroscopic database[J]. Journal of Quantitative Spectroscopy and Radiative Transfer, 2017, 203: 3-69.
[14] Markov V N, Krupnov A F. Measurements of the pressure shift of the 110-101 water line at 556 GHz produced by mixtures of gases[J]. Journal of Molecular Spectroscopy, 1995, 172(1): 211-214.
