Abstract
The straight channel optical waveguide coated with the SnO2 nanoparticle is studied as an all-optical humidity sensor. The proposed sensor shows that the transmission loss of the waveguide increases with increasing relative humidity (RH) from 56% to 90% with very good repeatability. The sensitivity to changes in relative humidity is ∼2 dB/% RH. The response time of the humidity sensor is 2.5 s, and the recovery time is 3.5 s. The response to humidity can be divided into 3 different regions, which are correlated to the degree of water adsorption in the SnO2 nanoparticle layer. Compared with the previous all-optical humidity sensor based on SnO2, the proposed sensor exhibits more rapid response, simpler fabrication process, and higher sensitivity. The proposed sensor has a potential application in the long distance, remote agriculture, and biological humidity sensing.
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Acknowledgment
This work is partially supported by the Ministry of Research, Technology & Higher Education of Indonesia with PMDSU scholarship funding, and the Malaysia Ministry of Higher Education (MOHE) (LRGS(2015)/NGOD/UM/KPT). We thank Gan and Wensin for assistance during the humidity measurement preparation and waveguide fabrication.
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Siddiq, N.A., Chong, W.Y., Pramono, Y.H. et al. All-Optical Humidity Sensor Using SnO2 Nanoparticle Drop Coated on Straight Channel Optical Waveguide. Photonic Sens 10, 123–133 (2020). https://doi.org/10.1007/s13320-019-0563-8
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DOI: https://doi.org/10.1007/s13320-019-0563-8