In-water fiber-optic evanescent wave sensing with quantum cascade lasers

Paul Chevalier*, Marco Piccardo, Guy Maël de Naurois, Ilan Gabay, Abraham Katzir, Federico Capasso

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The ability of detecting harmful chemicals is an important safety requirement for drinking water systems. An apparatus for in-water chemical sensing based on the absorption of evanescent waves generated by a quantum cascade laser array propagating in a silver halide optical fiber immersed into water is demonstrated. We present a theoretical analysis of the sensitivity of the system and experimentally characterize its real-time response and spectroscopic detection for injection of a sample chemical (ethanol) in a tube containing water.

Original languageEnglish
Pages (from-to)195-199
Number of pages5
JournalSensors and Actuators, B: Chemical
StatePublished - 1 Jun 2018


  • Attenuated total reflectance
  • Fiber-optic evanescent wave spectroscopy
  • Quantum cascade laser
  • Silver-halide fiber


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