• 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.