J. Hawecker, V. Pistore, A. Minasyan, K. Maussang, J. Palomo, I. Sagnes, J.-M. Manceau, R. Colombelli, J. Tignon, J. Mangeney, S. S. Dhillon. Cavity-based photoconductive sources for real-time terahertz imaging[J]. Photonics Research, 2020, 8(6): 858