“…Electromagnetic induced transparency (EIT), which is originally rooted in quantum physics system, has been widely used in the research of slow lights [48][49][50][51][52], sensors [53][54][55], absorbers [56][57][58], optical modulators [59,60], nonlinear enhancement [61,62], and other fields, due to its slow wave effect, strong dispersion, low absorption, and high-quality factor spectrum response. The analogue of EIT effect based on microwave metamaterials [52,[63][64][65], in particular, provides a new platform for the observation of slow wave effect, which not only is easy to adjust in structure, but also can visually reveal the strong dispersion effect caused by the EIT phenomenon.…”