Active control of electromagnetically induced transparency (EIT) in metamaterials promises tremendous potential applications. However, previously reported strategies most require sensitive materials as well as additional experimental apparatus, which are inconvenient for on-chip operation and restrain their implementations in fully integrated design. We propose a low-loss all-dielectric metamaterial with orthogonal double bright modes, which shows a narrowband transparency window at 950.05 nm with a high Q-factor of 2111. Just by varying the incident light polarization angle, an on-to-off in-situ EIT modulation without changing Q-factor is perfectly achieved, and the modulation depth can be up to 99.7%. Additionally, optical control of group delay with up to 36.22 ps is also demonstrated. This work provides a simple route to design chip-scale devices with optically dynamic controllability and finds fascinating applications in low-loss active slow light devices, optical switch and sensitive bio-sensing.

超材料中电磁感应透明度 (EIT) 的主动控制有望带来巨大的潜在应用。然而，之前报道的策略大多需要敏感材料以及额外的实验设备，这不利于片上操作，并且限制了它们在完全集成设计中的实现。我们提出了一种具有正交双亮模式的低损耗全介电超材料，它在 950.05 nm 处显示出窄带透明窗口，具有2111的高Q因子。仅通过改变入射光偏振角，在-原位EIT调制而不改变Q-factor完美实现，调制深度可达99.7%。此外，还演示了高达 36.22 ps 的群延迟的光学控制。这项工作为设计具有光学动态可控性的芯片级器件提供了一条简单的途径，并在低损耗有源慢光器件、光开关和灵敏的生物传感中找到了引人入胜的应用。