Mode transition in cooperative metamaterials at terahertz frequencies

摘要

By tailoring the intrinsic physical parameters of sub-resonators, we experimentally observe a mode transition in the cooperative metamaterials at terahertz frequencies. The transmission peak between the two lowest resonance modes experiences a non-monotonic change and the spectral response transforms from the V-type mode to the electromagnetically induced transparency-like state. Meanwhile, we employ a hybrid coupling model to theoretically study the influence of the near field coupling coefficient and the loss of resonators on their electromagnetic response and quantitatively analyze the transition of response. The calculation based on the model shows an excellent agreement with the simulated and experimental results. Our results not only provide a deep insight into the analogue of electromagnetically induced transparency but also offer an alternative approach to develop metamaterials-based devices such as slow light devices, switches, and filters in the terahertz region.