Browsing by Author "Hobar, Farida"

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    Comparative Study Of Transistors Electrical Characteristics Made In Bicmos Technology
    (Oum-El-Bouaghi University, 2019) Benchiheb, Asma; Hobar, Farida
    In this paper, a comparative study of two bipolar transistors realized according to the same BICMOS-0.35 technology, but with two different architectures (self-aligned and quasi-self-aligned) is presented. In each case, the type of material forming the base and the geometric differences existing between the two considered structures are taken into account. The simulation allowed us to demonstrate the interest in introducing germanium in quasi-self-aligned bipolar transistors. In addition, it has been found that in low and medium injection, the electrical characteristics of the self-aligned bipolar transistor deviate greatly from the experimental results. With the quasi-self-aligned architecture, this gap remains moderate. In strong injection, and in both types of transistors, the electrical characteristics are very close to those obtained experimentally. copyright 03.03.2019
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    Modeling Of 2d Photonic Crystals Waveguides
    (Oum-El-Bouaghi University, 2018) Benachour, Leila; Hobar, Farida
    Abstract Photonic crystals are nanometric structures which are composed of periodic elements of different permittivity in two or three dimensions. The periodic variation of the refractive index prevents the propagation of electromagnetic waves of certain frequencies. This implies the existence of photonic band corresponding to the frequency band in which the radiation cannot propagate. Their guide mechanism is completely different from that existing in conventional waveguides, since it is not the total reflection due to the difference in refractive indices which ensures the guiding, but the existence of a photonic band gap. This property is based on the design and development of new components based on photonic crystals for optoelectronics applications. In this paper, the parameters of structures, and the electromagnetic field propagation analyze, are determined based on 2D photonic crystal. Several guiding structures two-dimensional photonic crystals (W1 waveguide, the photonic crystal (PhC)-based L-junction waveguide T-shaped and waveguide intersection) and their electromagnetic fields distribution are optimized, using FDTD method (Finite Difference Time Domain) method and the software RSOFT with its simulation modules BeamPROP, FullWAVE.