Agarose coated micro-bottle sensor for relative humidity detection

Zain, Huda Adnan and Batumalay, Malathy and Johari, Md Ashadi Md and Dimyati, Kaharudin and Harun, Sulaiman Wadi (2021) Agarose coated micro-bottle sensor for relative humidity detection. Optoelectronics Letters, 17 (6). pp. 328-333. ISSN 1673-1905, DOI

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The whispering gallery mode (WGM) based micro-bottle resonator (MBR) sensor has been proposed and demonstrated for relative humidity measurement by using an agarose gel as a transducer. MBR was fabricated by using a soften-and-compress method to form a 190 pm bulge bottle. The micro-bottle was optically excited by a 3 pm tapered fiber and it exhibits a resonance with a Q factor in an order of 10 5 . The agarose coated MBR produces a good sensing response towards humidity with the sensitivity of 0.107 dB/%RH and linearity of 99.614%. The agarose hydrophilic nature and its changing porosity and refractive index with increasing relative humidity made the coated MBR structure to be more sensitive than the uncoated structure. This humidity sensor has a simple fabrication and is showing good sensitivity, linearity, resolution, response time and operational in a wide humidity range.

Item Type: Article
Funders: Universiti Malaya [Grant No: IIRG005C-19IISS], INTI International University [Grant No: INTI-FIT-03-2020]
Uncontrolled Keywords: Whispering gallery mode (WGM); Humidity measurement; Agarose coated micro-bottle sensor
Subjects: R Medicine > RE Ophthalmology > Optometry. Opticians. Eyeglasses
T Technology > T Technology (General)
Divisions: Faculty of Engineering > Department of Electrical Engineering
Depositing User: Ms Zaharah Ramly
Date Deposited: 11 May 2022 08:42
Last Modified: 11 May 2022 08:42

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