Theoretical and experimental investigation of on-chip mid-infrared chalcogenide waveguide CH4 sensor based on wavelength modulation spectroscopy

Mingquan Pi, Yijun Huang, Huan Zhao, Zihang Peng, Jiaming Lang, Jialin Ji, Ling Teng, Fang Song, Lei Liang, Yù Zhang, Chuantao Zheng, Yiding Wang, Frank K. Tittel