Whispering gallery modes on optical micro-bottle resonator for humidity sensor application
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 Db = 190μ...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier GmbH
2019
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| Online Access: | http://eprints.utem.edu.my/id/eprint/24205/2/WHISPERING%20GALLERY%20MODES%20ON%20OPTICAL%20MICRO-BOTTLE%20RESONATOR%20FORHUMIDITY%20SENSOR%20APPLICATION.PDF http://eprints.utem.edu.my/id/eprint/24205/ https://www.sciencedirect.com/science/article/pii/S0030402619304127 https://doi.org/10.1016/j.ijleo.2019.03.111 |
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| Summary: | 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 Db = 190μm, stem diameter of Ds = 125μm and bottle length of Lb = 182μm. The MBR is then optically excited by using a 2 μm optical microfiber and was found to have a Q-factor
of > 104. 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 > 105 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 |
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