tunable plasmon-induced transparency with ultra-broadband in dirac semimetal metamaterials

We proposed a numerical and theoretical research on the realization of the tunable plasmon-induced transparency (pit) with ultra-broadband at terahertz frequencies in dirac semimetal metamaterials. the effect of temperature on the pit window was analyzed simultaneously. the magnetic dipole coupling between “bright mode” and “dark mode” leads to a novel pit optical response. simulation results show that the maximum bandwidth of pit window can be increased to 426 ghz and 393 ghz by adjusting the dimensions of d1 and d2 in the dirac asymmetrical structure, respectively. moreover, we can dynamically tune the pit window frequency from 1.257 to 1.508 thz by adjusting the fermi energy from 70 to 90 mev. furthermore, a positive group delay of about 0.75 ps can be obtained by varying the fermi energy in the proposed structure. these results will bring a variety of potential applications in terahertz field.