Graphene-enabled electrically switchable radar-absorbing surfaces
Graphene-enabled electrically switchable radar-absorbing surfaces
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DOI：
10.1038/ncomms7628
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发表时间：
2015-03-01
影响因子：
16.6
通讯作者：
Kocabas, Coskun
中科院分区：
文献类型：
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作者：
Balci, Osman;Polat, Emre O.;Kocabas, Coskun
雷达吸收材料用于隐形技术，以隐藏物体免受雷达探测。电阻和/或磁性复合材料用于减少反向散射微波信号。然而，无法控制这些材料的电性能阻碍了主动伪装系统的实现。在这里，我们使用大面积石墨烯电极展示了能够对微波的反射、传输和吸收进行电控制的活性表面。我们的策略不是调整块状材料的特性，而是依赖于原子薄电极上电荷密度的静电调整，该电极在微波频率下充当可调谐金属。值得注意的是，我们报告了大面积自适应雷达吸收表面，在工作电压下可调节反射抑制比高达 50 dB
Radar-absorbing materials are used in stealth technologies for concealment of an object from radar detection. Resistive and/or magnetic composite materials are used to reduce the backscattered microwave signals. Inability to control electrical properties of these materials, however, hinders the realization of active camouflage systems. Here, using large-area graphene electrodes, we demonstrate active surfaces that enable electrical control of reflection, transmission and absorption of microwaves. Instead of tuning bulk material property, our strategy relies on electrostatic tuning of the charge density on an atomically thin electrode, which operates as a tunable metal in microwave frequencies. Notably, we report large-area adaptive radar-absorbing surfaces with tunable reflection suppression ratio up to 50 dB with operation voltages