This paper observed the performance of the coated optical microbottle resonator (MBR) for the liquid ethanol concentration sensor. The MBR is prepared in three sizes by a technique known as “soften-and-compress” from silica fiber SMF-28 with parameters named stem diameter, bottle length, and bottle diameter. The MBR is then coated with PMMA by the “drop-casting” technique used as an ethanol sensor. The MBR-PMMAs were characterized by microfiber diameter and managed to have a Q-factor. The ethanol liquid concentration used is from 10% to 100% ppm. The sensitivity, linearity, repeatability, stability, and wavelength shift results were then used to determine the performance of MBR-PMMAs as an ethanol sensor. The most significant size of MBR-PMMA, known as “C,” is defined as an excellent ethanol liquid concentration sensor. Additionally, the resonator's size is determined and may influence its ability to perform well as a sensor.

Original languageEnglish
Pages (from-to)690-696
Number of pages7
JournalMicrowave and Optical Technology Letters
Issue number2
Publication statusPublished - Feb 2023


  • ethanol liquid sensor
  • microbottle resonator
  • optical fiber
  • polymethyl methacrylate


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