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Optical microbottle resonator with polyvinyl alcohol coating for sodium alginate concentration sensing

AMINAH AHMAD1,* , MOHD HAFIZ JALI2, HAZIEZOL HELMI MOHD YUSOF3, MD ASHADI MD JOHARI1, SULAIMAN WADI HARUN4

Affiliation

  1. Faculty of Electrical and Electronic Engineering Technology, Universiti Teknikal Malaysia Melaka, 76100 Melaka, Malaysia
  2. Faculty of Electrical Engineering, Universiti Teknikal Malaysia Melaka, 76100 Melaka, Malaysia
  3. Faculty of Electronic and Computer Engineering, Universiti Teknikal Malaysia Melaka, 76100 Melaka, Malaysia
  4. Department of Electrical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia

Abstract

The research paper defined the effect of polyvinyl alcohol (PVA) coating on optical microbottle resonator (MBR) for sodium alginate concentration sensor. The resonator made from silica fiber SMF28 used a technique known as “soften-and-compress”. The MBRs size is based on the three parameters, which is bottle diameter (Db), stem diameter (Ds) and bottle length (Lb). The MBR was then coated with PVA and named MBR-PVA-A, MBR-PVA-B and MBR-PVA-C. The coated MBR-PVA was then coupled with microfiber for characterisation and able to have Q-factor >105 for all conditions. The MBR-PVAs were then used for the sodium alginate sensor with liquid concentrations ranging from 1% to 6%. The MBR-PVAs performance is ultimately excellent, where the results are based on transmitted power and wavelength shift analysis. The MBR-PVAs are promising as sodium alginate concentration sensors by the sensitivity, linearity, stability, and repeatability performance.

Keywords

Optical Microresonator, Microbottle Resonator, Sodium Alginate.

Citation

AMINAH AHMAD, MOHD HAFIZ JALI, HAZIEZOL HELMI MOHD YUSOF, MD ASHADI MD JOHARI, SULAIMAN WADI HARUN, Optical microbottle resonator with polyvinyl alcohol coating for sodium alginate concentration sensing, Optoelectronics and Advanced Materials - Rapid Communications, 16, 3-4, March-April 2022, pp.102-107 (2022).

Submitted at: June 29, 2021

Accepted at: April 7, 2022