Microfiber loop resonator for formaldehyde liquid sensing

Mohd Hafiz Jali, Hazli Rafis Abdul Rahim, Sana Sulaiman Hamid, Md Ashadi Md Johari, Haziezol Helmi Mohd Yusof, Siddharth Thokchom, Sulaiman Wadi Harun, M. Khasanah, M. Yasin

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)


This work employed the whispering gallery mode (WGM) of microfiber loop resonator (MLR) for formaldehyde (CH2O) liquid sensing application. A significant sensing response to different concentrations of formaldehyde liquid from 0% to 5% was observed due to the surface absorption and changeable refractive index resulting in different light attenuation in the silica microfiber. As the concentration increases, the output power of the MLR decreased linearly from −18.9 dB m to −36.2.dBm with sensitivity increased by a factor of 2.5 as compared to straight microfiber (SmF). As for resolution, the MLR improved by a factor of 3.28 as compared to SmF.

Original languageEnglish
Article number163174
Publication statusPublished - Nov 2019


  • Formaldehyde
  • Microfiber loop resonator
  • Straight microfiber
  • Whispering gallery mode


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