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      Enhanced tunability of V-shaped plasmonic structures using ionic liquid gating and graphene

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      Author(s)
      Ozdemir, O.
      Aygar, A. M.
      Balci, O.
      Kocabas, C.
      Caglayan, H.
      Özbay, Ekmel
      Date
      2016
      Source Title
      Carbon
      Print ISSN
      0008-6223
      Publisher
      Elsevier Ltd
      Volume
      108
      Pages
      515 - 520
      Language
      English
      Type
      Article
      Item Usage Stats
      185
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      250
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      Abstract
      Graphene is a strong candidate for active optoelectronic devices because of its electrostatically tunable optical response. Current substrate back-gating methods are unable to sustain high fields through graphene unless a high gate voltage is applied. In order to solve this problem, ionic liquid gating is used which allows substrate front side gating, thus eliminating the major loss factors such as a dielectric layer and a thick substrate layer. On the other hand, due to its two dimensional nature, graphene interacts weakly with light and this interaction limits its efficiency in optoelectronic devices. However, V-shaped plasmonic antennas can be used to enhance the incident electric field intensity and confine the electric field near graphene thus allowing further interaction with graphene. Combining V-shaped nanoantennas with the tunable response of graphene, the operation wavelength of the devices that utilize V-shaped antennas can be tuned in situ. In the present paper, we demonstrate a graphene-based device with ionic liquid gating and V- shaped plasmonic antennas to both enhance and more effectively tune the total optical response. We are able to tune the transmission response of the device for up to 389 nm by changing the gate voltage by 3.8 V in the mid-infrared regime.
      Keywords
      Antennas
      Electric fields
      Graphene
      Ionic liquids
      Liquids
      Optoelectronic devices
      Plasmons
      Reconfigurable hardware
      Threshold voltage
      Dielectric layer
      Electric field intensities
      Its efficiencies
      Operation wavelength
      Optical response
      Thick substrates
      Transmission response
      Two dimensional nature
      Graphene devices
      Permalink
      http://hdl.handle.net/11693/36869
      Published Version (Please cite this version)
      http://dx.doi.org/10.1016/j.carbon.2016.07.049
      Collections
      • Department of Electrical and Electronics Engineering 4011
      • Department of Physics 2550
      • Nanotechnology Research Center (NANOTAM) 1179
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