articleOptics ExpressFeb 5, 2026GOLD OA

All-fiber offset-core sandwich-structured gas sensor based on photothermal spectroscopy detection

CNChong NiuXYXinyu YangCLChuanning LiBLBangyu LiuCZchu zhang

Harbin Engineering University

PubMed
Indexed incrossrefdoajpubmed

Abstract

In this paper, we present the first-ever application of an all-fiber offset-core sandwich-structured Fabry-Pérot (OSFP) sensor for gas detection. This optical fiber sensor, featuring an ultra-compact footprint with a cavity length of merely 150 μm and a volume of less than 1.4 nL, constitutes a low-finesse Fabry-Pérot (FP) cavity. Specifically, the sensor is configured as a miniature FP interferometer, which exhibits low detection limits, facile fabrication, and high stability. By leveraging photothermal wavelength modulation combined with interferometric phase demodulation, this sensor enables the detection of acetylene (C 2 H 2 ) gas at parts-per-billion (ppb) levels. OSFP realizes highly stable gas…

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8
total citations
FWCI
67.90
Percentile
100%
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56
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10

Topics & keywords

Topics
Keywords
  • Optical fiber
  • Interferometry
  • Detection limit
  • Fiber optic sensor
  • Photothermal therapy
  • Spectroscopy
  • Acetylene
  • Parts-per notation
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