Browsing by Author "Lebbal, Mohamed Redha"

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    Magneto-optical properties of magnetic photonic crystal fiber of Cerium substituted yttrium iron garnet medium (Ce -YIG) filled with magnetic fluid Fe3O4
    (University of Oum El Bouaghi, 2021) Ghalem, Salim; Lebbal, Mohamed Redha; Bouchemat, Mohamed
    In this work, we propose a photonic crystal fiber based on magneto-photonic crystal (MPC), formed by a triangular ring of circular air holes filled with magnetic fluid (MF) based on magnetic nanoparticle Fe3O4, in a Cerium substituted yttrium iron garnet medium (Ce -YIG), in this fiber, we have theoretically studied the conversion mode, reported and studied the effect of some parameters such as the radius and using a beam propagation method (BPM) in two dimensions. In our proposed structure the maximum conversion modes ratio equal to 98% with low coupling length Lc=15μm is obtained for gyrotropy g=0.35 and Faraday Rotation FR=1900 × 104 deg ∕cm.
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    NOVEL DESIGN OF PHOTONIC CRYSTAL STRUCTURE BASED ON A COUPLED MICROCAVITYWAVEGUIDES FOR ALL-OPTICAL AND LOGIC GATES
    (University of Oum El Bouaghi, 2021) Derdour, Roumaissa; Lebbal, Mohamed Redha; Mouetsi, Souheil; Hocini, Abdesselam; Sadoun, Boumediene
    In this study, the transmission of the all-optical AND logic gate using a structure connected with a triangular photonic crystal lattice is improved. The proposed logic gate consists of a photonic crystal nano-resonator formed by changing the size of the air holes. In addition to the simplicity, the response time is very short and the designed nano-resonator increases the bit rate of the logic gate. The twodimensional finite difference time domain (2DFDTD) method is used to simulate the structure, the transmission obtained is about 98% with very negligible losses. The proposed photonic crystal AND logic gate are widely used in future integrated optical microelectronics.