• CUMALI SABAH

      Articles written in Pramana – Journal of Physics

    • Investigation of graphene-integrated tunable metamaterials in THz regime

      S MAHIRCAN DEMIR YAHYA YÜKSEK CUMALI SABAH

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      A metallic fishnet metamaterial structure in sub-THz region is presented. The proposed structure is based on hexagonal resonators. Simulations have been performed by a 3D full-wave electromagnetic simulator and a negative refractive index has been observed at the frequency range between 0.55 and 0.70 THz with the help of the graphene layer. In order to observe the effect of the graphene layer, the metamaterial structure has been simulatedand examined before and after graphene integration. Significant modification in the propagation properties has been observed after the graphene integration. Change in S-parameters with the size variation of hexagonal resonators and alteration in graphene thickness are also presented as a parametric study to show the tunability of the structure. Suitability of the metamaterial for sensor applications has been investigated. The proposed metamaterial structure is promising to be effectively used for tunability and sensor applications.

    • Cross-like terahertz metamaterial absorber for sensing applications

      CUMALI SABAH BATUHAN MULLA HAKAN ALTAN LUTFI OZYUZER

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      In this work, a new multiband terahertz metamaterial absorber is designed and characterised by numerical simulation method. In addition, the utilisation of the proposed absorber as a sensor is also investigated. The dielectric and thickness sensing characteristics are analysed. The proposed multiband metamaterial absorber has the ability for utilising the terahertz region up to 2THz. According to the results, it is found that the proposed absorber is capable of sensing unknown materials and material thickness with any of its five absorption bands. The sensitivity of the proposed sensor is 6.57GHz/unit sensitivity for dielectric sensing and 7.66 GHz/$\mu$m for thickness sensing.

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