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Experimental study on the sensing performance of optical microbottle resonator with polymethyl methacrylate coating C6H9NaO7 (Sodium Alginate) sensor

AMINAH AHMAD1,2,* , MD ASHADI MD JOHARI1,2, MOHD HAFIZ JALI3, HAZIEZOL HELMI MOHD YUSOF4, SULAIMAN WADI HARUN5

Affiliation

  1. Faculty of Electrical and Electronic Engineering Technology, Universiti Teknikal Malaysia Melaka, 76100 Melaka, Malaysia
  2. Forecasting and Engineering Technology Analysis (FETA) Research Group, Universiti Teknikal Malaysia Melaka, 76100 Durian Tunggal, Malaysia
  3. Faculty of Electrical Engineering, Universiti Teknikal Malaysia Melaka, 76100 Melaka, Malaysia
  4. Faculty of Electronic and Computer Engineering, Universiti Teknikal Malaysia Melaka, 76100 Melaka, Malaysia
  5. Department of Electrical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia

Abstract

This research explored the effect of polymethyl methacrylate (PMMA) coating on the Microbottle Resonator (MBR) that is used for sodium alginate concentration sensors. The MBR form by SMF28 used the "soften-and-compress" technique, which was further coated with PMMA solution and formed three different sizes. The MBR-PMMAs are characterised by tapered microfiber and managed to have Q-factor for all sizes, where MBR-PMMA-C is the highest at . The MBR-PMMAs experienced a sodium alginate concentration sensor with sensitivity, linearity, stability and repeatability observed as a measured parameter. The sodium alginate liquid concentration was between 1% ppm and 6% ppm. The results were then compared between transmitted power and wavelength shifting analysis. The biggest size of the coated resonator, MBR-PMMA-C, managed to have excellent performance from all measured parameters. Here, the size of the bottle structure of MBR with PMMA coating may influence the whispering gallery modes (WGMs) to increase the adsorption capability of the MBR as a sensor.

Keywords

Tapered Microfiber, PMMA, Sodium Alginate Concentration Sensing, Microbottle resonator.

Citation

AMINAH AHMAD, MD ASHADI MD JOHARI, MOHD HAFIZ JALI, HAZIEZOL HELMI MOHD YUSOF, SULAIMAN WADI HARUN, Experimental study on the sensing performance of optical microbottle resonator with polymethyl methacrylate coating C6H9NaO7 (Sodium Alginate) sensor, Optoelectronics and Advanced Materials - Rapid Communications, 17, 3-4, March-April 2023, pp.106-111 (2023).

Submitted at: Sept. 23, 2022

Accepted at: April 7, 2023