Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
11004306 | Optik - International Journal for Light and Electron Optics | 2018 | 14 Pages |
Abstract
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 190âμm. The MBR was optically excited by using a non-adiabatic 2âμm 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 4.397âdB/% 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 60âmin. This indicates that MBR sensor has a great potential to be employed as a low cost formaldehyde liquid sensor.
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Authors
M.A.M. Johari, A. Al Noman, M.I.M. Abdul Khudus, M.H. Jali, H.H.M. Yusof, S.W. Harun, M. Yasin,