The vast majority of gaseous chemical substances exhibit fundamental rovibrational
absorption bands in the mid-infrared spectral region (2.5–25 μm), and the absorption of light …

Several gas molecules of environmental and domestic significance exhibit a strong deep-UV
absorption. Therefore, a sensitive and a selective gas detector based on this unique …

Standoff detection of flammable and toxic gases simultaneously is important for leakage
warning and safe production in oil and gas industries. A portable and robust single-ended …

Laser absorption spectroscopy as a powerful tool for detecting trace gases has been widely
used in the monitoring of atmospheric greenhouse gases, pollutions, and respiration …

An ultra-high sensitivity sensor combining a mid-IR (MIR) interband cascade laser (ICL) at
center wavelength of 3.37 μm and a multi-pass cell (MPC) with a path-length of 580 m was …

We demonstrated a mid-infrared (mid-IR) gas sensor based on a hollow waveguide (HWG)
cell, which was fabricated with a flexible polycarbonate (PC) base tube. The HWG inner …

Compared with direct absorption spectroscopy (DAS), wavelength modulation spectroscopy
(WMS) with good ability of suppressing noise is rarely used in waveguide sensor. The …

Nanophotonic waveguides hold great promise to achieve chip-scale gas sensors. However,
their performance is limited by a short light path and small light–analyte overlap. To address …

Gas sensors have a wide variety of applications. Among various existing gas sensing
technologies, optical gas sensors have outstanding advantages. The development of the …

An efficient method for the detection of acetone, an important biomarker in exhaled breath,
by utilizing wavelength modulation spectroscopy (WMS) with a mid-infrared distributed …