Study of dual-spectral electromagnetically induced transparency in bright-dark mode coupling metamaterials

The transmission characteristics of a planar metamaterial, composed of two finite metal strips (with different length) and one double split-ring resonator (DSRR) have been numerically and experimentally investigated in this paper. By varying the length of the two strips slightly, this structure can exhibit single-band and dual-band electromagnetically induced transparency (EIT)-like spectral response in microwave region. The coupled oscillator model is employed to theoretically and quantitatively study the EIT profiles. Our work provides a way to obtain multiple EIT-like effects, and it may achieve potential applications in a variety of fields including filters, sensing, and some other microwave devices.