Ultrasensitive THz Sensor Based on Centrosymmetric F-Shaped Metamaterial Resonators
Anchen Ma, Renbin Zhong, Zhenhua Wu, Yiqing Wang, Yang Long, Zekun Liang, Zheng Fang, Shenggang Liu
Abstract
An ultra-sensitive metamaterial terahertz absorption sensor based on centrosymmetric double F-shaped metal resonators is proposed in this study. The sensor achieved a perfect narrow-band absorption spectrum at 5.92 THz with high quality factor of 49.6, it showed ultra-sensitive performance on the variation of refractive index and thickness of the surface analyte with sensitivity of 1800 GHz/RIU and figure of merit value of 15. Additionally, for a typical biomedical analyte of n = 1.3, the sensitivity was 134 GHz/µm. The excellent properties promise its significant practical applications in ultra-sensitive THz biomedical sensors and detectors.
Topics & Concepts
ResonatorTerahertz radiationFigure of meritMetamaterialMaterials scienceOptoelectronicsSensitivity (control systems)Refractive indexDetectorAbsorption (acoustics)AnalyteMetamaterial absorberSplit-ring resonatorOpticsTunable metamaterialsPhysicsChemistryElectronic engineeringPhysical chemistryEngineeringComposite materialMetamaterials and Metasurfaces ApplicationsTerahertz technology and applicationsPlasmonic and Surface Plasmon Research