Terahertz Metamaterial Absorber Sensor Based on Double-opening Metal Ring

Terahertz metamaterial biosensor is a label-free affinity sensor that enhances the strength of local electromagnetic field. It extremely sensitive to changes in dielectric constant surrounding environment, thereby providing new method detecting micro or trace biological samples. In this work, highly terahertz refractive index absorber for sample proposed. The consists two concentric open metal rings and multimode resonator. With independent adjustable operating bands frequency range 0.7–2.5 THz, i.e. 1.079 THz 2.271 can observe different effects band. We evaluate performance sensors with indicators such as absorption characteristics sensitivity. possesses higher than 99.9% free space. addition, large Q value indicates provides high selectivity characteristics. Especially, sensitivity achieves 693.7 GHz/RIU, minimum change 0.004 detection samples, which good sensing performance. proposed sensor, flexible material low used, has advantages biocompatibility portability shows stability at 0°–60° oblique incidence angle within 4% fabrication error. Moreover, effectiveness verified by simulation experiments ethanol-water mixtures. units designed paper have small interactions among them, work stably are easily fabricated significantly enhance interaction between light matter broad application prospects high-sensitivity biosensing detection.