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      Electrically controlled terahertz spatial light modulators with graphene arrays

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      Author(s)
      Kakenov, Nurbek
      Takan, T.
      Özkan, V. A.
      Balcı, Osman
      Polat, Emre Ozan
      Altan, H.
      Kocabaş, Coşkun
      Date
      2016
      Source Title
      Proceedings of the IEEE MTT-S International Microwave Symposium, IMS 2016
      Print ISSN
      0149-645X
      Publisher
      IEEE
      Language
      English
      Type
      Conference Paper
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      Abstract
      Gate-tunable high-mobility electrons on atomically thin graphene layers provide a unique opportunity to control electromagnetic waves in a very broad spectrum. In this paper, we describe an electrically-controlled multipixel terahertz light modulators. The spatial light modulator is fabricated using two large-area graphene layers grown by chemical vapor deposition and transferred on THz transparent and flexible substrates. Room temperature ionic liquid, inserted between the graphene, provides mutual gating between the graphene layers. We used passive matrix addressing to control local charge density thus the THz transmittance. With this device configuration, we were able to obtain 5×5 arrays of graphene modulator with 65% modulation between 0.1 to 1.5 THz.
      Keywords
      Active THz devices
      Graphene
      THz modulator
      Chemical vapor deposition
      Electromagnetic waves
      Ionic liquids
      Light modulation
      Modulators
      Permalink
      http://hdl.handle.net/11693/37716
      Published Version (Please cite this version)
      http://dx.doi.org/10.1109/MWSYM.2016.7540001
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      • Department of Physics 2485
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