Nov 2026· IEEE Photonics Technology Letters· Vol 38, pp. 1809-1812· 0 citations· 20 references
Abstract
A fast carbon dioxide (CO2) sensor utilizing an anti-resonant hollow-core fiber with microchannel arrays is demonstrated, where the microchannel arrays along the fiber cladding are precisely fabricated by a femtosecond laser to enhance the internal gas mass transfer rate to speed up the response. We utilized the method of direct absorption spectroscopy to calibrate the fiber sensor within a CO2 concentration range of 1% to 10% at the $2~\mu $ m wavelength band. A sensitivity of 0.155 a.u./% with a high linearity (R2) of 0.9935 in the experimental detection is characterized at 2004.33 nm. Meanwhile, the design of microchannel arrays along the fiber significantly improves diffusion dynamics, which reduces the response time from 355 s to 185 s at the steady state and achieves a limit of detection of 896.1 ppm. Benefiting from rapid dynamic response and excellent repeatability, the proposed fiber sensor provides a highly efficient in-line gas cell solution for the real-time quantitative monitoring of trace gases.
Despite the urgent need for high-sensitivity, fast-response, ambient-temperature CO2 sensing in environmental, industrial, and biomedical applications, conventional optical platforms suffer from weak light-matter interactions and poor signal contrast. Here, we propose and demonstrate a highly sensitive CO2 gas sensor b...
In this work, we proposed an anti-resonant hollow-core waveguide fluidic sensor for terahertz applications. The waveguide was designed to be fully compatible with fused deposition modeling technique, thus enabling easy and low‑cost fabrication. The sensor integrates built-in fluidic channels to enable direct liquid ana...
Guofu Xu, Hai-Yan Yang, Maosheng Yang et al.· International Conference on...· 0 citations
Refractive index (RI) sensors are indispensable for label-free biochemical analysis, environmental monitoring, and food safety. However, conventional optical sensors fundamentally rely on weak evanescent fields for analyte interaction, creating a persistent sensitivity bottleneck. Here, we overcome this limitation by i...
We report an elastic Fabry-Pérot microcavity (μFP) acoustic transducer that combines mechanical compliance with resonantly enhanced optical interrogation, boosting the conversion of pressure-induced diaphragm displacement into an optical signal. The transducer comprises a high-reflectivity concave mirror fabricated on...
