We present a dynamically tunable anomalous electromagnetic induced transparency (EIT) of a cavity-integrated metallic grating by the coupling of guided-mode resonance (GMR) with cavity-mode resonance (CMR) in the terahertz regime. The strong group slowing effect of terahertz waves results from the EIT mechanism under simultaneous excitation of GMR and CMR at a degenerate state. With the introduction of graphene as a functional layer overlying the grating structure, the enhanced group delay can be achievable beyond 6.1 ps with stable operation frequency and signal efficiency by tuning the graphene Fermi level. The work could provide an efficient scheme to manipulate the group velocity of terahertz signals.

中文翻译：

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腔集成导模谐振光栅的可调谐太赫兹慢光

我们通过太赫兹制导模共振（GMR）与腔模共振（CMR）的耦合，提出了一种腔体集成金属光栅的动态可调异常电磁感应透明度（EIT）。太赫兹波的强群减慢作用是由于在简并状态下同时激发GMR和CMR时的EIT机制引起的。通过引入石墨烯作为覆盖光栅结构的功能层，可以通过调节石墨烯费米能级，以稳定的工作频率和信号效率实现超过6.1 ps的增强群时延。这项工作可以提供一种有效的方案来操纵太赫兹信号的群速度。