Metamaterials with classical analogues of electromagnetically induced transparency open new avenues in photonics for realizing smaller, more efficient slow light devices without quantum approaches. However, most of the metamaterial-based slow light devices are passive, which limits their practical applications. Here, by combining diatomic metamaterials with a gated single-layer graphene, we demonstrate that the group delay of terahertz light can be dynamically controlled under a small gate voltage. Using a two coupled harmonic oscillators model, we show that this active control of group delay is made possible by an effective control of the dissipative loss of the radiative dark resonator by varying the graphene’s optical conductivity. Our work may provide opportunities in the design of various applications such as compact slow light devices and ultrasensitive sensors and switches.

中文翻译：

---

使用石墨烯超材料的电可调慢灯

具有电磁感应透明性的经典类似物的超材料为光子学开辟了新的途径，从而无需量子方法即可实现更小，更高效的慢光设备。但是，大多数基于超材料的慢速照明设备都是无源的，这限制了它们的实际应用。在这里，通过将双原子超材料与带门的单层石墨烯结合，我们证明了太赫兹光的群延迟可以在较小的栅极电压下动态控制。使用两个耦合的谐波振荡器模型，我们表明，通过有效地控制石墨烯的光导率来控制辐射暗谐振腔的耗散损耗，可以有效地控制群时延。