Ultrafast Frequency Shift of Electromagnetically Induced Transparency in Terahertz Metaphotonic Devices

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Abstract
Recently, the actively controlled meta‐atoms have been employed to manipulate terahertz (THz) waves allowing for the implementation of many functionalities operating. A salient example of such systems is the electromagnetically induced transparency (EIT) metaphotonic device, which opens up a new avenue for THz manipulations. However, these devices are currently limited to be tuned at a given frequency, which severely impedes their practical applications. Here, novel photo‐active THz meta‐atoms are proposed, whose EIT resonance is equipped with a frequency tuning functionality up to 36%. At different levels of optical pumping power, a substantial modulation of EIT resonance is realized at the fundamental and shifted frequency, respectively. Moreover, the ultrafast dynamics manifest the switching time scale of ≈1 ns. This configuration is easily extensible by other types of stimuli, which may contribute to the development of multifunctional active tuning meta‐photonic systems.
Funding Information
  • Hunan Provincial Innovation Foundation for Postgraduate (CX2018B006)
  • Natural Science Foundation of Hunan Province (2016JJ1021)
  • National Natural Science Foundation of China (11802339, 11805276, 61805282, 61801498, 11804387, 11902358)

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