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The Quality Factor in 2D Anisotropic Photonic Crystal Cavity

100%
Bouleghlimat O., Hocini A.
Acta Physica Polonica A
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2015
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vol. 127
|
issue 4
976-978
EN
This work focuses on the study of the influence of geometrical parameters on the quality factor of a cavity H1, realized with one missing hole in the center. For obtaining the H1 characteristics and the band structure of the photonic crystal, the finite difference time domain (FDTD) method, which is based on solving Maxwell's equations in a spatially and temporally discretized domain, and plane wave expansion (PWE) method, which is a resolution method of Maxwell equations in the frequency domain, were used respectively. In this method, one simulates a space of theoretically infinite extent with a finite computational cell. The quality factor increases until a maximum value equal 1.23×10⁶ for a filling factor r/a=0.44, and then decreases to a value of 3.39×10⁵ for a filling factor r/a=0.47.
2
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Mode Conversion in SiO₂/ZrO₂ Layer Doped with Magnetic CoFe₂O₄ Nanoparticles

100%
Bouras M., Hocini A.
Acta Physica Polonica A
|
2015
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vol. 127
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issue 4
1191-1194
EN
This paper describes the TE-TM mode conversion in a magneto-optical layer made by a SiO₂/ZrO₂ layer doped with magnetic CoFe₂O₄ nanoparticles. The mode conversion is caused by the Faraday rotation if the magnetization is aligned along the z-axis, parallel to mode propagation. The properties of this phenomenon are simulated using the full-vectorial beam propagation method (BPM). The simulation results show clearly the influence of two parameters in such devices, the first one is the off-diagonal component of tensor that enhances the rotation and the second one, the imaginary diagonal tensor (parameters K ) which makes it suffering from absorption. This result of simulation is an important step to achieve a monolithic integration of optical isolators.
3
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Compact Modeling of the Performance of SB-CNTFET as a Function of Geometrical and Physical Parameters

100%
Diabi A., Hocini A.
Acta Physica Polonica A
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2015
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vol. 127
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issue 4
1124-1127
EN
In this work, we study the effects of geometrical and physical parameters on the performances of SB-CNTFET using a compact model. The influences of the physical parameters (height of the Schottky barrier (Φ_{SB}) capacity of oxide layer (C_{INS}) and geometrical parameter (nanotube diameter (d_{CNT})) on the static performance (I_{ON}/I_{OFF}) of SB-CNTFET have been investigated. We present a detailed analysis of the electrical performance of the SB-CNTFET or current-voltage characteristics (I_{D}=f(V_{DS}) for different values of V_{GS}, and also the characteristics (I_{D}=f(V_{GS})) for different values of V_{DS}. All these circuits are studied for a fixed value of Φ_{SB}=0.275 eV.
4
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Study of Two-Dimensional Photonic Crystal Microcavities as a Function of Refractive Index

81%
Moukhtari R., Hocini A., Khedrouche D.
Acta Physica Polonica A
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2016
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vol. 129
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issue 4
556-558
EN
Quality factor of two-dimensional photonic crystals microcavity fabricated by SiO₂/ZrO₂ or SiO₂/TiO₂ in which the refractive index varied in the range of 1.51 to 1.58 has been investigated in the present paper. The structure studied consists of circular rods of radius r embedded in air slab, while a is the constant of triangular lattice. Finite difference time domain method with perfectly matched layers was used to calculate the transmission spectrum by FullWAVE software. The results of simulation clearly demonstrate the existences of resonance wavelength of which the position and the highest Q (Q ≈ 4×10⁵) value are strongly affected by refractive index. We demonstrate that the calculated Q factor for the designed cavity increases by a factor of three relative for a cavity without increasing the refractive index.
5
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Bandwidth Improvement for Compact Microstrip Patch Antenna Using Metamaterials

81%
Bougoutaia T., Khedrouche D., Hocini A.
Acta Physica Polonica A
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2016
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vol. 129
|
issue 4
538-540
EN
An improved ultra-wideband (UWB) and high gain rectangular microstrip antenna is specifically designed in this paper using planar metamaterial based on double-ring resonators (DRR). The antenna has three double-ring resonators (DRRs) etched on the metal patch, and a partial ground plane so that the impedance matching characteristics of the antenna are much better. The -10 dB impedance bandwidth of the proposed antenna is 2.33-16.96 GHz. The antenna is promising for many applications such as WiMAX (2500-2690 MHz), Bluetooth (2400-2480 MHz) and UWB (3.1-10.7 GHz) applications. In addition, the proposed antenna has an average gain of 4.24 dB and a peak gain of 6.87 dB at 12.2 GHz.
6
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Design of Pressure Sensor Based on Two-Dimensional Photonic Crystal

81%
Zouache T., Hocini A., Harhouz A., Mokhtari R.
Acta Physica Polonica A
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2017
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vol. 131
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issue 1
68-70
EN
In this work, we design a new pressure sensor based on two-dimensional photonic crystal waveguide coupled to a point-defect resonant microcavity. The mechanism of sensing is based on the change of the germanium refractive index as function of the hydrostatic pressure P. The resonant wavelength will shift when pressure variation induces change in the refractive indexes of the structure. The pressure variation causes the shifting of defect modes. The properties of the refractive index sensor are simulated using the finite-difference time-domain algorithm and the plane wave expansion method. These kinds of sensors have many advantages in compactness, high sensitivity, and various choices of materials.
7
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Study of the Absorption in Solar Cells with 2D Photonic Crystals

81%
Ouanoughi A., Hocini A., Khedrouche D.
Acta Physica Polonica A
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2015
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vol. 127
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issue 4
1205-1207
EN
In this work, we design via numerical simulation the absorption properties of silicon nanohole arrays of vertically aligned square lattice arrays with lattice constants varying from 300 nm to 400 nm, using the finite difference time-domain method (FDTD). The silicon (Si) is chosen as prototype material for this study due to better understanding of the material properties and widely available optical data. The parameters for photonic crystals are optimized through computer simulations to obtain the maximum absorption and path length enhancement. We investigated the performance of the considered structure and determined the geometrical parameters that allow a better absorption.
8
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Mode Conversion in 2D Magneto Photonic Crystals Made of SiO₂/ZrO₂ Matrix Doped With Magnetic Nanoparticles

81%
Kahlouche A., Hocini A., Khedrouche D.
Acta Physica Polonica A
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2015
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vol. 127
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issue 4
1208-1210
EN
In this work, we theoretically study the use of magneto-photonic crystal for amplification of the magneto-optical effects, to improve the merit factor. A two dimensional magneto-photonic waveguide device, formed by a triangular lattice of air holes, embedded in SiO₂/ZrO₂ matrix doped with magnetic nanoparticles, is used to study the influence of the volume fraction (VF %) on the mode conversion. We have used the beam propagation method (BPM) to simulate the efficiency coefficient in a planar 2D magneto-photonic waveguide. The influence of VF % on propagation length is studied, and an enhancement in Faraday rotation in 2D magneto photonic crystal is achieved, which proves the ability of the structure to produce magneto-photonic crystal isolator.
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