Highly sensitive terahertz sensors based on polarization independent and multiple resonance

Recently, benefitted from the excellent capability of metasurface, the high-sensitivity THz sensing can be achieved. However, the polarization dependency and single-resonance mode still hinder the further improvement in sensitivity. In this paper, we designed a polarization-independent and multi-resonances metasurface for high-performance THz sensing. The transmission spectrum of metasurface exhibits three polarization-independent and strong resonance peaks in 0.1–2.5 THz, and all of them show high sensitivity related to ambient refractive index. The transmitted structure and polarization-independent resonance can relief the difficulty of measurement. We believe these studies will lay the theoretical and technical foundation for the design of high-sensitivity terahertz sensing.