resonance bandwidth controllable adjustment of electromagnetically induced transparency-like using terahertz metamaterial

In the fields of communication and sensing, resonance bandwidth is a very critical index. it is very meaningful to implement a broadband resonance device with a simple metamaterial structure in the terahertz band. in this paper, we propose a simple metamaterial structure which consists of one horizontal metal strip and two vertical metal strips. this structure can achieve an electromagnetically induced transparency-like (eit-like) effect in the frequency range of 0.1~3.0 thz to obtain a transparent window with a resonance bandwidth as high as 1.212 thz. when the relative distance between two vertical metal strips is changed, the bandwidth can be effectively controlled. furthermore, we found that the eit-like effect can be actively adjusted by replacing vertical metal strips with photosensitive silicon.