Xiyu Lu, Yanjiao Guan, Pengchang Yang, Shan Niu, Yu Ma, Lijun Wang, Ning Zhuo, Jinchuan Zhang, Shenqiang Zhai, Fengmin Cheng, Shuman Liu, Fengqi Liu, Junqi Liu, "Dual-mode distributed feedback quantum cascade laser based on stacked 3D monolithic integration for on-chip multi-channel gas sensing," Photonics Res. 11, 2113 (2023)