Type

Conference Proceedings

Authors

Dejan Liu
Vishnan Kavungal
Yuliya Semenova
Arun Mallik

Subjects

Physics

Topics
refractive index optical resonators manufacturing agarose hydrogel fiber optic sensors microsphere resonator micro optical devices micro structured fibers

Compact Humidity Sensor Based on a Multi-layer Agarose Hydrogel Coated Silica Microsphere Resonator (2017)

Abstract In this paper we report on a novel approach to implementing a compact humidity sensor that utilizes whispering gallery mode (WGM) phenomena in a silica microsphere coated with Agarose hydrogel. The spectral positions of the WGM resonances for such a sensor depend strongly on the refractive index and thickness of the coating. The WGM’s spectral shift occurs due to adsorption/desorption of the water vapor in response to changes in ambient humidity and also due to the corresponding changes of the coating thickness. We experimentally investigated the WGMs spectral shift for a 100 μm diameter silica microsphere coated with Agarose hydrogel over a wide range of relative humidity (RH) values from 30%RH to 70%RH at a constant temperature. Six dip coating cycles of 2.25% wt. /vol. Agarose hydrogel were carried out in sequence with a characterization of the sensor performed for each coating thickness. A resonance shift of 16 nm is achieved in our experiment for the six-layer Agarose hydrogel coating sensor
Collections Ireland -> Dublin Institute of Technology -> Conference Papers
Ireland -> Dublin Institute of Technology -> College of Engineering and Built Environment
Ireland -> TU Dublin -> Conference Papers
Ireland -> Dublin Institute of Technology -> Colleges
Ireland -> TU Dublin -> School of Manufacturing and Design Engineering
Ireland -> TU Dublin -> Colleges
Ireland -> Dublin Institute of Technology -> School of Manufacturing and Design Engineering
Ireland -> TU Dublin -> College of Engineering and Built Environment

Full list of authors on original publication

Dejan Liu, Vishnan Kavungal, Yuliya Semenova, Arun Mallik

Experts in our system

1
Dejan Liu
TU Dublin
Total Publications: 3
 
2
Vishnan Kavungal
Dublin Institute of Technology
Total Publications: 3
 
3
Yuliya Semenova
TU Dublin
Total Publications: 136
 
4
Arun Mallik
TU Dublin
Total Publications: 26