Microbottle resonator for formaldehyde liquid sensing

M. A.M. Johari, A. Al Noman, M. I.M. Abdul Khudus, M. H. Jali, H. H.M. Yusof, S. W. Harun, M. Yasin

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)


We have successfully investigated the use of a whispering gallery mode (WGM) optical micro-bottle resonator (MBR) for liquid formaldehyde (CH2O) sensing. The MBR was fabricated via the “soften-and-compress” method to create a bulge (bottle) structure with a bottle diameter of 190 μm. The MBR was optically excited by using a non-adiabatic 2 μm optical microfiber and was found to have a Q-factor of >105. The MBR was then employed to measure formaldehyde concentration within 1–5% range and the performance was compared with a bare microfiber. The MBR sensor was found to have a sensitivity of 4.397 dB/% with 90% linearity which were superior to the bare microfiber. The MBR sensor was also found to have good repeatability and stability over a period of 60 min. This indicates that MBR sensor has a great potential to be employed as a low cost formaldehyde liquid sensor.

Original languageEnglish
Pages (from-to)180-184
Number of pages5
Publication statusPublished - Nov 2018


  • Formaldehyde liquid
  • Optical microbottle resonator
  • Quality factor
  • Tapered microfiber
  • Whispering gallery mode


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