Twist-assisted high sensitivity chiral fiber sensor for Cd2+ concentration detection
Boyao Li,
Yaoyao Liang,
Aoyan Zhang,
Lu Peng,
Jinghua Sun,
Guiyao Zhou
Affiliations
Boyao Li
School of Electronic Engineering and Intelligentization, Dongguan University of Technology, Dongguan, Guangdong, 523808, China; Guangzhou Key Laboratory for Special Fiber Photonic Devices and Applications, School of Information Optoelectronics Science and Technology, South China Normal University, Guangzhou, Guangdong 510006, China; Corresponding author
Yaoyao Liang
Centre de Nanosciences et de Nanotechnologies, CNRS, University Paris-Sud, Université Paris-Saclay, C2N – 10 Boulevard Thomas Gobert, Palaiseau 91120, France
Aoyan Zhang
Guangzhou Key Laboratory for Special Fiber Photonic Devices and Applications, School of Information Optoelectronics Science and Technology, South China Normal University, Guangzhou, Guangdong 510006, China
Lu Peng
School of Physical Sciences, The University of Adelaide, Adelaide, SA 5005, Australia
Jinghua Sun
School of Electronic Engineering and Intelligentization, Dongguan University of Technology, Dongguan, Guangdong, 523808, China
Guiyao Zhou
Guangzhou Key Laboratory for Special Fiber Photonic Devices and Applications, School of Information Optoelectronics Science and Technology, South China Normal University, Guangzhou, Guangdong 510006, China
Summary: The ability to accurately and cost-friendly monitor heavy metals in environmental solutions such as drinking or tap water is of great significance to the human health. We report a twisted fiber-based sensing mechanism that can realize highly accurate detection of Cd2+ concentration in water solution. The basic design is a twisted single-core fiber simply coated with a propylene thiourea membrane that can absorb Cd2+. Due to the twisting effect, light in the core can scatter into the cladding, yielding optical coupling and interference. We experimentally prove that both positions and amplitudes of interference dips in the sample transmission spectrum can effectively and linearly response to the change of Cd2+ concentration at the level of 10−11 mol/L. With bimodal calibration, such sensor can realize accurate and real-time monitor in a stable and nontoxic way. These excellent characteristics indicate promising potential in the field of biochemical and integrated optical sensing.
