Terahertz (THz) topological photonic structures are promising for last-centimeter communication in intra/interchip communication systems because they support bit-error-free THz signal transmission with topological robustness. Active and dynamically tunable THz topological photonic components have not yet been experimentally realized. Here, we experimentally demonstrate a THz topological switch (270–290 GHz) based on a valley Hall photonic crystal structured high-resistivity silicon substrate, in which the THz waves can be dynamically turned on/off by an external 447 nm continuous-wave laser. Our device exhibited an on/off ratio of 19 dB under a pumping light intensity of $240{\mathrm{mW}/\mathrm{mm}}^2$. The 3 dB switching bandwidth was $\sim 60\mathrm{kHz}$.

中文翻译：

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用于片上通信的太赫兹拓扑光子波导开关

太赫兹（THz）拓扑光子结构有望用于芯片内/芯片间通信系统中的最后一厘米通信，因为它们支持具有拓扑鲁棒性的无误码太赫兹信号传输。有源和动态可调谐的太赫兹拓扑光子组件尚未通过实验实现。在这里，我们通过实验演示了一种基于谷霍尔光子晶体结构的高电阻率硅衬底的太赫兹拓扑开关（270-290 GHz），其中太赫兹波可以通过外部 447 nm 连续波激光器动态打开/关闭. 在泵浦光强度为$240{\mathrm{兆瓦}/\mathrm{毫米}}^2$. 3 dB 开关带宽为$～60\mathrm{千赫}$.