Ultra-Sensitive Terahertz Metamaterial Sensor Based on Three-Dimensional Triangular Split Ring Resonator

an ultra-sensitive three-dimensional triangular resonator (DTSRR) sensor is designed and its transmission characters in the terahertz frequency range (0.1 $\sim$ 1.8 THz) is studied. The resonance and sensing performance of the designed DTSRR unit has been systematically analyzed. At the same time, under the influence of electromagnetic waves, the design of this DTSRR unit not only eliminates anisotropy, but also significantly reduces the dielectric losses caused by the dielectric substrate. This structure reaches a maximum refractive index sensitivity level of 1037 GHz/RIU. These findings might facilitate the design of ultrasensitive real time chemical and biomolecular sensors in the fingerprint region of the terahertz regime.