Electromagnetic induced transparency (EIT) in terahertz band can achieve group delay and transparent window, which is attractive in biosensing field. In this paper, based on the phase transition properties of vanadium dioxide (VO2), an EIT with metasurface is designed to adjust the frequency position of transparent window. The unit cell of the metasurface consists of a cut wire (CW) resonator embedded with VO2 and two C-shaped ring resonators. The simulations show that when VO2 is in the insulating phase, the EIT window appears at 0.58-0.74 THz. While VO2 is in the metallic phase, the EIT window is located at 0.37-0.50 THz. The proposed structure has the active regulation of the EIT frequency band, which provides great potential for the sensitivity detection in THz.

Electromagnetic induced transparency (EIT) refers to the phenomenon of a sharp transmission window in a broad absorption profile, which was first discovered in the interference between the electronic transition paths of three energy levels. In this work, a metasurface structure with EIT is designed by coupling a dark-like mode and a bright mode. In order to make its resonance intensity dynamically adjustable, the metasurface structure in this paper adds a structure composed of vanadium dioxide (VO2) to the original EIT structure. When vanadium dioxide is at different temperature, its conductivity is different, and the degree of participation in metasurface resonance is different. Thus, the dynamic tuning of the EIT resonance intensity is realized, and the modulation depth can reach 76.18%.