Wideband and Large Angle Electromagnetically Induced Transparency by the Equivalent Transmission Line in a Metasurface

Abstract

A classical structure for a U-shaped metasurface exhibiting a wideband and large angle electromagnetically induced transparency (EIT) effect in the terahertz range is proposed. One horizontal and two vertical strips, which represent the bright and dark modes, respectively, are created for the U-shaped structure. The finite integration time domain (FITD) and equivalent circuit method are compared with the EIT result. The EIT effect is affected by the length of the vertical bar and by the distance from the vertical bar to the symmetry axis. The results show that the asymmetry of the main structure in the x and y axes makes it easier to achieve the EIT effect. In addition, by changing the incident angle, the EIT effect always exists until the angle of the incidental electromagnetic wave is 85 degrees. These results have many potential applications for terahertz filtering, large-angle switching and sensors.

Bi-funtional resonance effects of plasmon-induced transparency and Fano-like response using an asymmetry metamaterial resonator consisting of three metallic strips at terahertz frequency

“…These exotic electromagnetic properties are determined by the artificial structures rather than the properties of the material. Metamaterials whose unit size is smaller than the wavelength of incident light, which can manipulate the electromagnetic waves [8][9][10][11]. Since its first demonstration, the investigation of terahertz metamaterials have attracted considerable attention, and many interesting phenomena have been proposed, such as electromagnetically induced transparency, plasmon-induced transparency, Fano resonance, perfect absorption, etc [12][13][14][15][16][17][18].…”