[2] Siegel P H. Terahertz technology[J]. IEEE Transactions on Microwave Theory and Techniques, 50, 910-928(2002).
[3] Yao J Q. Introduction of THz-wave and its applications[J]. Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition), 22, 703-707(2010).
[7] Faist J, Capasso F, Sivco D L et al. Quantum cascade laser[J]. Science, 264, 553-556(1994).
[8] Kohler R, Tredicucci A, Beltram F et al. Terahertz semiconductor-heterostructure laser[J]. Nature, 417, 156-159(2002).
[31] Wallis R. Degl'Innocenti R, Jessop D S, et al. Efficient coupling of double-metal terahertz quantum cascade lasers to flexible dielectric-lined hollow metallic waveguides[J]. Optics Express, 23, 26276-26287(2015).