Graphene Oxide Functionalized Optical Planar Waveguide for Water Content Measurement in Alcohol  

作　　者：Wenghong LIM Yuenkiat YAP Choonkong LAI Wuyi CHONG Harith AHMAD 

机构地区：[1]Photonics Research Centre,University of Malaya,Kuala Lumpur 50603,Malaysia [2]Heriot-Watt University Malaysia,Putrajaya 62200,Malaysia [3]Department of Physics,Faculty of Science,University of Malaya,Kuala Lumpur 50603,Malaysia

出　　处：《Photonic Sensors》2020年第3期215-222,共8页光子传感器（英文版）

基　　金：This research work is jointly supported by the Ministry of Education Fundamental Research Grant Scheme(Grant No.FRGS/1/2018/STG02/HWUM/02/2);University of Malaya Research grant(Grant No.RU013-2019);the Asian Office of Aerospace Research and Development(AOARD)Grant(Grant No.16IOA017).

摘　　要：An abrupt change in optical transmission characteristic of a graphene oxide(GO)coated optical planar waveguide was observed.This observation was based on the peculiar characteristics of the graphene oxide film,namely its high transverse-electric polarized light propagation loss,highly selective permeability of water,and change in optical propagation characteristic in the presence of water.The as-fabricated GO-coated optical waveguide showed a large polarization dependent loss of~32 dB in the C-band optical fiber communication window(1550 nm).The response of the proposed sensor was first tested by using water.When a drop of water was applied onto the GO coating,the large polarization dependent loss was fully suppressed almost instantaneously.This effect was reversible as the polarization dependent loss was restored after complete water evaporation from the GO coating.All-optical measurement of water content in alcohol was then demonstrated by using the GO-coated optical waveguide.By analyzing the drying profile of the water-alcohol mixture,water content in the range of 0.2 volume%-100 volume%could be measured.These measurements were carried out by using solution volume of 1.0μL only.The all-optical sensing nature of the proposed sensor has potential applications in in-situ monitoring of water content in alcohol.

关 键 词：Graphene oxide water content alcohol solution optical waveguide 

分 类 号：TN252[电子电信—物理电子学]