Li Zhe Wen, Li Jiu-Sheng
Appl Opt. 2020 Dec 10;59(35):11076-11079. doi: 10.1364/AO.412728.
Many modern terahertz systems require dynamic manipulation of a terahertz wave. We proposed a terahertz wave switch based on a / structure. The transmittance and conductivity characteristics of the in a terahertz region have been measured by terahertz time-domain spectroscopy and analyzed using the Drude model. An ON-OFF switching speed as fast as 2 MHz and an extinction ratio as high as 17.7 dB was achieved at an external laser irradiance of 1.3/. The switching characteristics of the device can be explained by the accumulation of carriers at the interface that induces terahertz wave intense absorption. Our approach can effectively be used to realize a wide range of dynamically tunable terahertz functional devices. This makes its use viable for a range of communication, imaging, and sensing applications.
许多现代太赫兹系统需要对太赫兹波进行动态操控。我们提出了一种基于/结构的太赫兹波开关。通过太赫兹时域光谱法测量了太赫兹区域内的透射率和电导率特性，并使用德鲁德模型进行了分析。在1.3/的外部激光辐照度下，实现了高达2 MHz的开-关切换速度和高达17.7 dB的消光比。该器件的开关特性可以通过界面处载流子的积累来解释，这种积累会引起太赫兹波的强烈吸收。我们的方法可以有效地用于实现各种动态可调谐太赫兹功能器件。这使得它在一系列通信、成像和传感应用中具有可行性。
