Photothermal multi-species detection in a hollow-core fiber with frequency-division multiplexing

Zhen Wang, Hui Zhang, Jianing Wang, Shoulin Jiang, Shoufei Gao, Yingying Wang, Wei Jin, Qiang Wang, Wei Ren

Research output: Journal article publicationJournal articleAcademic researchpeer-review

12 Citations (Scopus)


A photothermal gas sensor has been developed for simultaneous multi-species detection in a hollow-core fiber based on the frequency-division multiplexing technique. By passing multiple pump lasers and a probe laser through a gas-filled hollow-core anti-resonant fiber (HC-ARF), the absorption-generated modulation of the refractive index at various frequencies is sensitively detected by an in-line interferometer. Three distributed-feedback diode lasers at C-band, L-band and U-band are employed as pump lasers for C2H2, CO2 and CH4 detection. Assisted by optical power amplifiers, the sensor achieves noise equivalent concentrations of 2.5 ppb, 21 ppm and 200 ppb for C2H2, CO2 and CH4, respectively. The sensor demonstrates excellent linear response to gas concentrations with R-square values between 0.996 and 0.999. Measurement of the three gas species with time-varying concentrations, as well as the aforementioned experiments, further validates the simultaneous multi-species detection with high sensitivity, compact size, and extremely low gas consumption.

Original languageEnglish
Article number132333
JournalSensors and Actuators B: Chemical
Publication statusPublished - 15 Oct 2022


  • Frequency-division multiplexing
  • Hollow-core fiber
  • Multi-species detection
  • Photothermal spectroscopy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry


Dive into the research topics of 'Photothermal multi-species detection in a hollow-core fiber with frequency-division multiplexing'. Together they form a unique fingerprint.

Cite this