Non-dispersive infrared multi-gas sensing via nanoantenna integrated narrowband detectors

Xiaochao Tan, Heng Zhang, Junyu Li, Haowei Wan, Qiushi Guo, Houbin Zhu, Huan Liu and Fei Yi ()
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Xiaochao Tan: Huazhong University of Science and Technology
Heng Zhang: Huazhong University of Science and Technology
Junyu Li: Huazhong University of Science and Technology
Haowei Wan: Huazhong University of Science and Technology
Qiushi Guo: Yale University
Houbin Zhu: Shandong University
Huan Liu: Huazhong University of Science and Technology
Fei Yi: Huazhong University of Science and Technology

Nature Communications, 2020, vol. 11, issue 1, 1-9

Abstract: Abstract Non-dispersive infrared (NDIR) spectroscopy analyzes the concentration of target gases based on their characteristic infrared absorption. In conventional NDIR gas sensors, an infrared detector has to pair with a bandpass filter to select the target gas. However, multiplexed NDIR gas sensing requires multiple pairs of bandpass filters and detectors, which makes the sensor bulky and expensive. Here, we propose a multiplexed NDIR gas sensing platform consisting of a narrowband infrared detector array as read-out. By integrating plasmonic metamaterial absorbers with pyroelectric detectors at the pixel level, the detectors exhibit spectrally tunable and narrowband photoresponses, circumventing the need for separate bandpass filter arrays. We demonstrate the sensing of H2S, CH4, CO2, CO, NO, CH2O, NO2, SO2. The detection limits of common gases such as CH4, CO2, and CO are 63 ppm, 2 ppm, and 11 ppm, respectively. We also demonstrate the deduction of the concentrations of two target gases in a mixture.

Date: 2020
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DOI: 10.1038/s41467-020-19085-1

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