Agarose coated micro-bottle sensor for relative humidity detection

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 µm bulge bottle. The micro-bottle was optic...

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Bibliographic Details
Published in:Optoelectronics letters 2021-06, Vol.17 (6), p.328-333
Main Authors: Zain, Huda Adnan, Batumalay, Malathy, Johari, Md Ashadi Md, Dimyati, Kaharudin, Harun, Sulaiman Wadi
Format: Article
Language:English
Subjects:
Humidity
Humidity measurement
Lasers
Optical Devices
Optics
Photonics
Physics
Physics and Astronomy
Q factors
Refractivity
Relative humidity
Response time
Sensitivity
Sensors
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Summary: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 µm bulge bottle. The micro-bottle was optically excited by a 3 µm 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.
ISSN:1673-1905
1993-5013
DOI:10.1007/s11801-021-0142-2