Abstract:We first review the working principle, choice of materials and typical applications of pyroelectric detectors, and then discuss the tuning of the photoresponses of pyroelectric detector pixels using optical antennas. We propose a multiplexed non-dispersive infrared（NDIR）gas sensing platform consisting of narrowband infrared detector array as read-out. By integrating optical antenna based plasmonic metamaterial absorbers with pyroelectric detectors at the pixel level, the detectors exhibit spectrally tunable and narrowband photoresponse, circumventing the need for separate bandpass filter arrays. We demonstrate the single gas sensing of H2S、CH4、CO2、CO、NO、CH2O、NO2、SO2，respectively. The measured detection limits of single gas experiments are comparable to commercial NDIR sensors. We also develop a mathematical model and demonstrate the deduction of the concentrations of the target gases in a mixture from the readouts of multiple narrowband detectors. Finally, we examine the capability of the narrowband detector array in the spectroscopic analysis of various solids, liquids and gases, and discuss the applications in security, military, industrial production, chemical engineering, food safety and environmental protection.