Whispering gallery modes on optical micro-bottle resonator for humidity sensor application

Johari, Md Ashadi Md and Abdul Khudus, Muhammad Imran Mustafa and Jali, Mohd Hafiz and Al Noman, Abdullah and Harun, Sulaiman Wadi (2019) Whispering gallery modes on optical micro-bottle resonator for humidity sensor application. Optik, 185. pp. 558-565. ISSN 0030-4026, DOI https://doi.org/10.1016/j.ijleo.2019.03.111.

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Official URL: https://doi.org/10.1016/j.ijleo.2019.03.111


We investigate the use of a class of whispering gallery mode optical resonators, namely, optical microbottle resonators (MBR) as a relative humidity (RH) sensor. The MBR is fabricated via the so-called “soften-and-compress” method to create a bulge (bottle) structure with a bottle diameter D b =190⁡μm, stem diameter of D s =125⁡μm and bottle length of L b =182⁡μm. The MBR is then optically excited by using a 2 μm optical microfiber and was found to have a Q-factor of >10 4 . The MBR was then employed as a humidity sensor with a RH range of between 40%–80% and the performance is compared with a no-MBR microfiber. The MBR RH sensor was found to have a sensitivity 0.0487 dB/%, linearity >90% and P-value >10 5 and is superior to the no-MBR microfiber in all measured parameters. The MBR RH sensor was also found to have good repeatability and stability over a period of 60 s. The wavelength shifted for the MBR is 0.03 nm greater than no-MBR. © 2019 Elsevier GmbH

Item Type: Article
Uncontrolled Keywords: Microfiber optic; Optical Micro-resonator; Humidity sensor
Subjects: Q Science > QC Physics
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Engineering
Faculty of Science > Department of Physics
Depositing User: Mr. Mohd Safri
Date Deposited: 17 Mar 2020 04:28
Last Modified: 17 Mar 2020 04:28
URI: http://eprints.um.edu.my/id/eprint/16726

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