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      Graphene-enabled electrically switchable radar-absorbing surfaces

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      Author
      Balci O.
      Polat, E.O.
      Kakenov, N.
      Kocabas, C.
      Date
      2015
      Source Title
      Nature Communications
      Print ISSN
      20411723
      Publisher
      Nature Publishing Group
      Volume
      6
      Language
      English
      Type
      Article
      Item Usage Stats
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      Abstract
      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 <5 V. Using the developed surfaces, we demonstrate various device architectures including pixelated and curved surfaces. Our results provide a significant step in realization of active camouflage systems in microwave frequencies. © 2015 Macmillan Publishers Limited. All rights reserved.
      Keywords
      graphene
      absorption
      alkene
      electrical property
      electrode
      magnetic property
      microwave radiation
      radar
      Article
      electric conductivity
      electric potential
      electrode
      electromagnetic radiation
      ionic strength
      microwave radiation
      oxidation reduction reaction
      telecommunication
      Permalink
      http://hdl.handle.net/11693/22247
      Published Version (Please cite this version)
      http://dx.doi.org/10.1038/ncomms7628
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      • Department of Physics 2299
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