Lee Geon, Kim Sung Jun, Roh Yeeun, Lee Sang-Hun, Kim Dai-Sik, Kim Sang Woo, Seo Minah
Sensor System Research Center, Korea Institute of Science and Technology (KIST), Seoul 02792, Republic of Korea.
Department of Physics and Astronomy, Seoul National University, Seoul 08826, Republic of Korea.
iScience. 2022 Mar 7;25(4):104033. doi: 10.1016/j.isci.2022.104033. eCollection 2022 Apr 15.
In the terahertz (THz) electromagnetic wave regime, which has recently received great attention in the fields of communication and security, shielding of THz waves is a significant issue. Therefore, carbon-based nanostructures or polymer-carbon nanocomposites have been widely explored. Herein, significantly enhanced THz shielding efficiency is reported for silver nanowires coated with reduced graphene oxide (rGO) and nanoscale THz metamaterials, as compared to the cases without nanoscale metamaterials. Using a nanoslot-patterned metamaterial with strong resonances at certain frequencies, THz transmission in intensity is enhanced up to three orders of magnitude. Enhanced transmission by nanopatterns substantially increases the shielding performance to the external THz waves, even for ultrathin films (several tens of nanometers) produced by a simple spray of rGO (a few nm of flakes) on a complex random nanowire network. Excellent shielding performance is presented and the shielding mechanism is investigated by the nanoprobing configuration at the same time.
在太赫兹（THz）电磁波领域，该领域最近在通信和安全领域受到了极大关注，太赫兹波的屏蔽是一个重要问题。因此，人们对碳基纳米结构或聚合物 - 碳纳米复合材料进行了广泛探索。在此，与没有纳米级超材料的情况相比，报道了涂覆有还原氧化石墨烯（rGO）的银纳米线和纳米级太赫兹超材料具有显著提高的太赫兹屏蔽效率。使用在特定频率具有强共振的纳米槽图案超材料，太赫兹强度传输增强了三个数量级。纳米图案增强的传输显著提高了对外部太赫兹波的屏蔽性能，即使对于通过在复杂随机纳米线网络上简单喷涂rGO（几纳米薄片）制成的超薄膜（几十纳米）也是如此。同时展示了优异的屏蔽性能，并通过纳米探测配置研究了屏蔽机制。
