Journal
OPTIK
Volume 173, Issue -, Pages 180-184Publisher
ELSEVIER GMBH, URBAN & FISCHER VERLAG
DOI: 10.1016/j.ijleo.2018.08.022
Keywords
Whispering gallery mode; Optical microbottle resonator; Tapered microfiber; Quality factor; Formaldehyde liquid
Categories
Funding
- Airlangga University
- Ministry of Research, Technology and Higher Education, Indonesia through KLN programme, 2018
- Newton Institutional Links, UK
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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 190 mu m. The MBR was optically excited by using a non-adiabatic 2 mu m optical microfiber and was found to have a Q-factor of > 10(5). 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 4.397 dB/% 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 60 min. This indicates that MBR sensor has a great potential to be employed as a low cost formaldehyde liquid sensor.
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