[1] M. Tonouchi. Cutting-edge terahertz technology. Nat. Photonics, 1, 97(2007).

[2] Z. Y. Tan, W. J. Wan, H. Li, J. C. Cao. Progress in real-time imaging based on terahertz quantum-cascade lasers. Chin. Opt., 10, 68(2017).

[3] A. W. M. Lee, Q. Hu. Real-time, continuous-wave terahertz imaging by use of a microbolometer focal-plane array. Opt. Lett., 30, 2563(2005).

[4] A. W. M. Lee, B. S. Williams, S. Kumar, Q. Hu, J. L. Reno. Real-time imaging using a 4.3-THz quantum cascade laser and a 320×240 microbolometer focal-plane array. IEEE Photon. Technol. Lett., 18, 1415(2006).

[5] N. Oda, H. Yoneyama, T. Sasaki, M. Sano, S. Kurashina, I. Hosako, N. Sekine, T. Sudoh, T. Irie. Detection of terahertz radiation from quantum cascade laser, using vanadium oxide microbolometer focal plane arrays. Proc. SPIE, 6940, 69402Y(2008).

[6] N. Oda, T. Ishi, T. Morimoto, T. Sudou, H. Tabata, S. Kawabe, K. Fukuda, A. W. M. Lee, Q. Hu. Real-time transmission-type terahertz microscope with palm size terahertz camera and compact quantum cascade laser. Proc. SPIE, 8496, 84960Q(2012).

[7] A. W. M. Lee, Q. Qin, S. Kumar, B. S. Williams, Q. Hu. Real-time terahertz imaging over a standoff distance (>25 meters). Appl. Phys. Lett., 89, 141125(2006).

[8] Z. Y. Tan, L. Gu, T. H. Xu, T. Zhou, J. C. Gao. Real-time reflection imaging with terahertz camera and quantum cascade laser. Chin. Opt. Lett., 12, 070401(2014).

[9] N. Oda, A. W. M. Lee, T. Ishi, I. Hosako, Q. Hu. Proposal for real-time terahertz imaging system with palm-size terahertz camera and compact quantum cascade laser. Proc. SPIE, 8363, 83630A(2012).

[10] A. Bergeron, M. Terroux, L. Marchese, O. Pancrati, M. Bolduc, H. Jerominek. Components, concepts, and technologies for useful video rate THz imaging. Proc. SPIE, 8544, 85440C(2012).

[11] N. Oda, T. Ishi, S. Kurashina, T. Sudou, M. Miyoshi, T. Morimoto, T. Yamazaki, T. Tsuboi, T. Sasaki. Palm-size and real-time terahertz imager, and its application to development of terahertz sources. Proc. SPIE, 8716, 871603(2013).

[12] S. Z. Fan, F. Qi, T. Notake, K. Nawata, Y. Takida, T. Matsukawa, H. Minamide. Diffraction-limited real-time terahertz imaging by optical frequency up-conversion in a DAST crystal. Opt. Express, 23, 7611(2015).

[13] F. Simoens, J. Meilhan, J.-A. Nicolas. Terahertz real-time imaging uncooled arrays based on antenna-coupled bolometers or fet developed at CEA-leti. J. Infrared Millim. Te., 36, 961(2015).

[14] R. I. Stantchev, X. Yu, T. Blu, E. Pickwell-MacPherson. Real-time terahertz imaging with a single-pixel detector. Nat. Commun., 11, 2535(2020).

[15] Z. Y. Tan, H. Y. Wang, W. J. Wan, J. C. Cao. Dual-beam terahertz quantum cascade laser with >1 W effective output power. Electron. Lett., 56, 1204(2020).