Multi-band tunable electromagnetically induced transparencies based on active metasurface with polarization-independent property

Abstract

The analogue of electromagnetically induced transparency (EIT) spectrum is achieved using a metasurface that consists of an array of cross and L-shaped resonators. The mechanism of the EIT-like phenomenon is analyzed, and the influence of geometrical parameters on the effect is discussed. We achieve multi-band EIT-like through structure configuration. In particular, polarization-independent EIT is realized. The potential application in sensing is suggested and the sensitivity of 65 GHz / RIU is obtained. We also investigate the impact of analyte and substrate on the transmission spectrum. We find that when the analyte thickness is higher than 40μm, EIT spectral shift is less affected by the analyte thickness. The thickness insensitive characteristic is beneficial for reducing errors caused by analyte dose, thereby improving the accuracy of sensing. By introducing phase change material Vanadium dioxide, we obtain active control on EIT effect. Our results provide valuable insights into the development of multi-band tunable compact devices based on metasurfaces.