Now showing items 1-13 of 13

    • Analysis of mutual acoustic coupling in CMUT arrays using an accurate lumped element nonlinear equivalent circuit model 

      Oğuz, H.Kağan; Atalar, Abdullah; Köymen, Hayrettin (2012)
      We use an accurate nonlinear equivalent circuit model to analyze CMUT arrays with multiple cells, where every cell in the array is coupled to other cells at their acoustic terminals through a mutual radiation impedance ...
    • Continuously tunable terahertz metamaterial employing magnetically actuated cantilevers 

      Ozbey, B.; Aktas O. (Optical Society of American (OSA), 2011)
      Terahertz metamaterial structures that employ flexing microelectromechanical cantilevers for tuning the resonance frequency of an electric split-ring resonator are presented. The tuning cantilevers are coated with a magnetic ...
    • Controlling phase of microwaves with active graphene surfaces 

      Balci O.; Kakenov N.; Kocabas C. (American Institute of Physics Inc., 2017)
      In this letter, we report a method to control the reflection phase of microwaves using electrically tunable graphene devices. The device consists of mutually gated large-area graphene layers placed at a quarter-wave distance ...
    • Directional selectivity through the subwavelength slit in metallic gratings 

      Cakmakyapan, S.; Caglayan, H.; Serebryannikov, A.; Ozbay, E. (2011)
      An approach for obtaining strong directional selectivity through a single subwavelength slit in non-symmetric metallic gratings is shown theoretically and experimentally. Directionality effect originates from the different ...
    • Flexible strain sensors based on electrostatically actuated graphene flakes 

      Fardindoost, S.; Alipour, A.; Mohammadi, S.; Gökyar, S.; Sarvari, R.; Iraji Zad, A.; Demir, H. V. (Institute of Physics Publishing, 2015)
      In this paper we present flexible strain sensors made of graphene flakes fabricated, characterized, and analyzed for the electrical actuation and readout of their mechanical vibratory response in strain-sensing applications. ...
    • Magnetic resonance imaging assisted by wireless passive implantable fiducial e-markers 

      Gokyar, S.; Alipour, A.; Unal, E.; Atalar, E.; Demir, H. V. (Institute of Electrical and Electronics Engineers, 2017)
      This paper reports a wireless passive resonator architecture that is used as a fiducial electronic marker (e-marker) intended for internal marking purposes in magnetic resonance imaging (MRI). As a proof-of-concept ...
    • Metamaterial Absorber Based Multifunctional Sensor Application 

      Ozer Z.; Mamedov A.M.; Ozbay, E. (Institute of Physics Publishing, 2017)
      In this study metamaterial based (MA) absorber sensor, integrated with an X-band waveguide, is numerically and experimentally suggested for important application including pressure, density sensing and marble type detecting ...
    • Metamaterial-based wireless strain sensors 

      Melik, R.; Unal, E.; Perkgoz, N. K.; Puttlitz, C.; Demir, H. V. (American Institute of Physics, 2009-07-07)
      We proposed and demonstrated metamaterial-based strain sensors that are highly sensitive to mechanical deformation. Their resonance frequency shift is correlated with the surface strain of our test material and the strain ...
    • Nested metamaterials for wireless strain sensing 

      Melik, R.; Unal, E.; Perkgoz, N. K.; Santoni, B.; Kamstock, D.; Puttlitz, C.; Demir, H. V. (IEEE, 2009-12-28)
      We designed, fabricated, and characterized metamaterial-based RF-microelectromechanical system (RF-MEMS) strain sensors that incorporate multiple split ring resonators (SRRs) in a compact nested architecture to measure ...
    • Optimization and tunability of deep subwavelength resonators for metamaterial applications: complete enhanced transmission through a subwavelength aperture 

      Alici, K.B.; Bilotti F.; Vegni L.; Ozbay, E. (Optical Society of American (OSA), 2009)
      In the present work, we studied particle candidates for metamaterial applications, especially in terms of their electrical size and resonance strength. The analyzed particles can be easily produced via planar fabrication ...
    • Photonic magnetic metamaterial basics 

      Alici, K. B.; Serebryannikov, A. E.; Ozbay, E. (Elsevier, 2010-07-21)
      In the present study, we provide a detailed analysis for the study of photonic metamaterials. We demonstrate the polarization and orientation dependent transmission response of split ring resonators at the infrared and ...
    • Rayleigh-bloch waves in CMUT arrays 

      Atalar, Abdullah; Köymen, H.; Oğuz, H. K. (Institute of Electrical and Electronics Engineers Inc., 2014)
      Using the small-signal electrical equivalent circuit of a capacitive micromachined ultrasonic transducer (CMUT) cell, along with the self and mutual radiation impedances of such cells, we present a computationally efficient ...
    • Transmission properties of various split-ring resonator systems 

      Aydin, K.; Bulu I.; Guven, K.; Ozbay, E. (Optical Society of America, 2006)
      We investigated the magnetic resonance of split-ring resonators (SRR) experimentally. The dependence of the geometrical parameters on the resonance frequency of SRR is studied. We further investigated the effect of disorder ...