4.7 Article

Polyvinyl alcohol coating microbottle resonator on whispering gallery modes for ethanol liquid sensor

Journal

OPTICS AND LASER TECHNOLOGY
Volume 143, Issue -, Pages -

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.optlastec.2021.107379

Keywords

Optical microbottle resonator; Whispering gallery modes; Ethanol sensor

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This experimental paper investigates the impact of PVA coating on microbottle resonator as a liquid ethanol sensor, finding that a coating diameter < 10 µm has a positive effect on sensing performance. The MBR-PVA-C shows the best performance among all conditions, with a sensitivity of 0.2699 dB/%ppm in transmitted spectral analysis and 99.2% linearity.
This experimental paper study on the effect of polyvinyl alcohol (PVA) coating on whispering gallery modes on microbottle resonator (MBR) as liquid ethanol sensor. The silica fiber SMF-28 is used to create microbottle resonator using a technique known as soften-and-compress and formed in three sizes with bottle length L-b, stem diameter of D-s and bottle diameter of D-b. The MBR then coated with PVA using a drop-casting technique with the coating diameter < 10 mu m for all. The MBR-PVAs characterized with microfiber of 2 mu m and managed to have > 10(4) for Q-factor for all condition with MBR-PVA-C is the highest, 2.783 x 10(4). The ethanol liquid with concentrations ranging from 10% to 100 %ppm is used for sensing purposes. Sensitivity, linearity, repeatability and stability performance by MBR-PVAs then compared between transmitted spectral and wavelength shift analysis. The MBR-PVA-C defined to have the best performance for all than another size of MBR-PVAs. Transmitted spectral analysis showed the sensitivity is 0.2699 dB/%ppm with 99.2% of linearity, and wavelength shift analysis showed the sensitivity is 0.2 pm/%ppm with a linearity of 98.01% respectability. Hence, MBR-PVAs experienced three cycles of repeatability and a 60-second stability procedure for performance optimization.

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