Abstract In recent years, research progress in terahertz devices has affected the development of terahertz communications. In this article, an asymmetric metamaterial coated with the GaAs layer is proposed and numerically demonstrated for terahertz wave optical switching. Based on the Fano resonance of the asymmetric metamaterial, the modulation depth of 80% for Fano peak can obtained by changing the conductivity of the GaAs layer via optical pump. In addition, the modulation mechanism is discussed in detail. Therefore, this work proves the feasibility of the structure and its potential application in ultrafast optical pump terahertz switching.

中文翻译：

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基于非对称超材料结构的太赫兹波光切换

摘要 近年来，太赫兹器件的研究进展影响了太赫兹通信的发展。在本文中，提出了一种涂有 GaAs 层的非对称超材料，并通过数值证明了太赫兹波光开关。基于非对称超材料的 Fano 共振，通过光泵改变 GaAs 层的电导率，可以获得 Fano 峰 80% 的调制深度。此外，详细讨论了调制机制。因此，这项工作证明了该结构的可行性及其在超快光泵太赫兹开关中的潜在应用。