Electromagnetically induced transparency in terahertz metasurface composed of meanderline and U-shaped resonators.

Mimicking the quantum phenomena of electromagnetically induced transparency using metasurfaces has drawn continuous interest in recent years owing to its potential in realizing optical switching, slow-light, nonlinear enhancement, and sensing devices with much reduced working conditions. Various kinds of structures have been proposed through designing the internal coupling effect among the unit cell. In this work, we theoretically and experimentally propose a new type of coupled resonant structures composed of meanderline and U-shaped resonators in the terahertz regime, which can exhibit strong behavior of electromagnetically induced transparency. The introduction of the meanderline structure provides an effective manner for realizing electrically controlled electromagnetically induced transparency devices due to its continuous connection feature, making it convenient to serve as an integrated electrode. Such ability is verified by simulations where vanadium dioxide structures are further integrated. The proposed design opens new avenues to realize compact and tunable slow-light devices.