Simultaneous Measurements of Refractive Index and Methane Concentration through Electromagnetic Fano Resonance Coupling in All-Dielectric Metasurface
Hai Liu,
Xu Zhang,
Benlei Zhao,
Bo Wu,
Hancheng Zhang,
Shoufeng Tang
Affiliations
Hai Liu
Engineering Research Center of Intelligent Control for Underground Space Ministry of Education, China University of Mining and Technology, Xuzhou 221116, China
Xu Zhang
School of Information and Control Engineering, China University of Mining and Technology, Xuzhou 221116, China
Benlei Zhao
School of Information and Control Engineering, China University of Mining and Technology, Xuzhou 221116, China
Bo Wu
School of Information and Control Engineering, China University of Mining and Technology, Xuzhou 221116, China
Hancheng Zhang
School of Information and Control Engineering, China University of Mining and Technology, Xuzhou 221116, China
Shoufeng Tang
Engineering Research Center of Intelligent Control for Underground Space Ministry of Education, China University of Mining and Technology, Xuzhou 221116, China
Dual-parameter measurements of refractive index and methane concentration based on electromagnetic Fano resonance are proposed. Two independent Fano resonances can be produced through electric dipole and toroidal dipole resonance in an all-dielectric metasurface separately. The linear relationship between the spectral peak-shifts and the parameters to be measured will be obtained directly. The refractive index (RI) sensitivity and gas sensitivity are 1305.6 nm/refractive index unit (RIU), −0.295 nm/% for one resonance peak (dip1), and 456.6 nm/RIU, −0.61 nm/% for another resonance peak (dip2). Such a metasurface has simpler structure and higher sensitivity, which is beneficial for environmental gas monitoring or multi-parameter measurements.
