Ultrafast control of slow light in THz electromagnetically induced transparency metasurfaces [Early Posting]
In this paper, we experimentally demonstrate ultrafast optical control of slow light in the THz range, by combing the electromagnetically induced transparency (EIT) metasurfaces with the cut wire made of P<sup>+</sup>-implanted silicon with short carrier lifetime. Employing the optical-pump terahertz-probe spectroscopy, we observed that the device transitioned from a state with a slow light effect to a state without a slow light effect in an ultra-fast time of 5 ps and recovered within 200 ps. A coupled oscillator model is utilized to explain the origin of controllability. The experimental results agree very well with the simulated and theoretical results. This EIT metasurfaces have the potential to be used as an ultrafast THz optical delay device.
Zhao Yi,Huang Qiuping,Cai Honglei,Lin Xiaoxia,He Hongchuan,Cheng Hao,Ma Tian,Lu Yalin. Ultrafast control of slow light in THz electromagnetically induced transparency metasurfaces[J].Chinese Optics Letters,2021,19(7):07.