Agarose coated micro-bottle sensor for relative humidity detection
Document Type
Article
Publication Date
6-1-2021
Abstract
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.
Keywords
Whispering gallery mode (WGM), Humidity measurement, Agarose coated micro-bottle sensor
Divisions
sch_ecs
Funders
Universiti Malaya [Grant No: IIRG005C-19IISS],INTI International University [Grant No: INTI-FIT-03-2020]
Publication Title
Optoelectronics Letters
Volume
17
Issue
6
Publisher
Tianjin Univ Technology