• D-shaped photonic crystal fiber based surface plasmon resonance sensor D-Şeklinde fotonik kristal fiber tabanli yüzey plazmon rezonans sensörü

      Yaşli, Ahmet; Ademgil, Huseyin; Haxha, Shyqyri; Lefke Avrupa Üniversitesi; University of Bedfordshire (Institute of Electrical and Electronics Engineers Inc., 2018-07-09)
      In this study, we have proposed photonic crystal fiber based surface plasmon resonance sensor, where hexagonally arranged circular air holes surrounded the core of photonic crystal fiber. Gold has been placed on top surface as a metallic layer, while all the structure covered with analyte channel. Full Vectorial Finite Elimination Method has been used for analysing effective refractive index and confinement losses for proposed sensor. When refractive index of analyte channel changes, spectral interrogation and amplitude methods have been used for calculating the sensitivities and resolutions of offered sensor.
    • Dual core photonic crystal fiber based sensor Çift çekirdekli fotonik kristal fiber tabanli sensor

      Ademgil, Huseyin; Eze, Festus Uchenna; Arca, Ahmet; Haxha, Shyqyri; Lefke Avrupa Üniversitesi; University of Bedfordshire (IEEE Computer Society, 2014-06-12)
      In this study, the relative sensitivity coefficient of the proposed hexagonal shaped photonic crystal fiber (PCF) has been investigated by employing the full vectorial finite element method (FEM). Propagation loss of the three different liquid analyte with 35 elliptical air holed PCF over wide wavelength range has been investigated. Also, the applications and the propagation characteristics of the proposed PCF structure which occurs with the interaction of the fundamental mode and the liquid filled holes have been discussed. © 2014 IEEE.
    • Effect of the elliptic rods orientations on the asymmetric light transmission in photonic crystals

      Soltani, A.; Ouerghi, F.; AbdelMalek, Fathi; Haxha, Shyqyri; Ademgil, Huseyin; Akowuah, Emmanuel K.; El-Manar University, Tunisia; University of Bedfordshire; European University of Lefke, Turkey; Kwame Nkrumah University of Science and Technology, Ghana (Elsevier, 2017-02-03)
      In this work, we report a novel design of a photonic crystal utilizing elliptic rods. The two-dimensional (2D) photonic crystal consists of an asymmetric distribution of unit cells to ensure the one-way transmission of light. Analysis performed indicated that the orientation of the ellipse along the major and minor axis has an influence on the shift of the transmission. In particular, this results in shift of the transmission towards high frequencies and subsequent oscillation of its magnitude. The peak of the transmission band was also found to be strongly influenced by the orientation angle, θ. It has been demonstrated that the strong asymmetric propagation properties of the proposed photonic crystal structure enables the switching of incident light from one direction to another. The proposed structure may be applied as a building block to integrated photonics applications.
    • PCF based sensor with high sensitivity, high birefringence and low confinement losses for liquid analyte sensing applications

      Ademgil, Huseyin; Haxha, Shyqyri; ; European University of Lefke; University of Bedfordshire (MDPI AG, 2015-12-13)
      In this paper, we report a design of high sensitivity Photonic Crystal Fiber (PCF) sensor with high birefringence and low confinement losses for liquid analyte sensing applications. The proposed PCF structures are designed with supplementary elliptical air holes in the core region vertically-shaped V-PCF and horizontally-shaped H-PCF. The full vectorial Finite Element Method (FEM) simulations performed to examine the sensitivity, the confinement losses, the effective refractive index and the modal birefringence features of the proposed elliptical air hole PCF structures. We show that the proposed PCF structures exhibit high relative sensitivity, high birefringence and low confinement losses simultaneously for various analytes.
    • Photonic crystal fiber based surface plasmon sensor design and analyze with elliptical air holes

      Yaşli, Ahmet; Akowuah, Emmanuel K.; Haxha, Shyqyri; Ademgil, Huseyin; European University of Lefke; Kwame Nkrumah University of Science and Technology; University of Bedfordshire (Institute of Electrical and Electronics Engineers Inc., 2016-11-24)
      A photonic crystal fiber (PCF) based surface plasmon resonance (SPR) sensor has been presented at this work. The sensor sensitivity for multiple analyte depending on operating wavelength and spectral interrogation mode has been investigated thoroughly. Our numerical results indicate that the sensitivity of the x-polarized fundamental mode is 4100nm/Refractive Index Unit (RIU) and 4400nm/RIU for the y-polarized fundamental mode with 2.4×10-5 RIU and 2.3×10-5 RIU sensor resolutions respectively.
    • Unidirectional light propagation photonic crystal waveguide incorporating modified defects

      Soltani, A.; Ouerghi, F.; AbdelMalek, Fathi; Haxha, Shyqyri; Ademgil, Huseyin; Akowuah, Emmanuel K.; Université de Tunis El Manar; University of Bedfordshire; European University of Lefke; Kwame Nkrumah University of Science and Technology (Elsevier GmbH, 2016-11-29)
      In this paper, we have proposed a design of an Optical Diode-like in two-dimensional (2D) Photonic Crystal (PC) waveguide. The proposed device consists of 2D square-lattice PC structures, and it is based on two PC waveguides with different symmetric guiding modes, where various configurations of defects, including elliptic or/and semi-circular defects have been incorporated. The proposed one-way light propagation Optical Diode has been designed and optimized by employing in-house 2D Finite Difference Time Domain (FDTD) numerical method. We have reported that the unidirectional light propagation depends strongly on the coupling region between the introduced defects and the adjacent waveguides, and it also depends on the matching and mismatching between the defects and waveguide modes. It has been shown also that owing to its tunable features, the proposed Optical Diode can be potentially applied as a building block in future complex optical integrated circuits.