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Potential of SPR Sensors Based on Multilayer Interfaces With Gold and LHM for Biosensing Applications

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Photonic Sensors 2017年第3期7卷 199-205页

作者： Abdellatif CHERIFI Benamar bouhafs University of Tlemcen Theoretical Physics Laboratory Physics of Department Tlemcen 13000 Algeria

Recently, the subject on ＂plasmonics＂ has received significant attention in designing surface plasmon resonance （SPR） sensors. In order to achieve extremely high-sensitivity sensing, multilayered configurations based on a variety of active materials and dielectrics have been exploited. In this work, a novel SPR sensor is proposed and investigated theoretically. The structure, analyzed in attenuated total reflection （ATR）, consists of multilayer interfaces between gold and a metamaterial （LHM） separated by an analyte layer as a sensing medium. By interchanging between gold and LHM, under the effect of the refractive index （RI） of analyte set to be in the range of 1.00 to 1.99, the sharp peak reflectivity at the SPR angle takes two opposite behaviors predicted from the transfer matrix method. At the threshold value of 1.568 of the refractive index of analyte and when the LHM is the outer medium, the layered structure exhibits a giant sharp peak located at 43° of intensity up to 105 due to the Goos-Hanchen effect. With respect to the refractive index （RI） change and thickness of analyte, the characteristics （intensity, resonance condition, and quality factor） of the SPR mode, which make the proposed device have the potential for biosensing applications, have been analytically modelized.

关键词： Plasmonic goos-Hhnchen (GH) effect SPR sensor systems sub-wavelength scale

Analysis of Coupled Surface Plasmon in LHM Mediated Dielectric Gap Multilayer Structure

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Photonic Sensors 2020年第2期10卷 113-122页

作者： Mohammed BENDJEBBOUR Abdellatif CHERIFI Benamar bouhafs University of Tlemcen Faculty of SciencesTheoretical Physics LaboratoryTlemcen 13000Algeria

The purpose of this work is to investigate theoretically the characteristics of confined electromagnetic modes propagating along the interfaces of a multilayer *** one dimensional(1D)sensor is formed by stacking a left-handed material(LHM)layer between a SiO2-glass prism and a dielectric gap layer in contact with gold(Au).The results indicate that the total thickness of the LHM layer and dielectric gap,in optimum conditions,give the ability of tuning significantly the characteristics of the resonant modes correlated to surface plasmons(SPs)propagation along the interfaces of the designed *** considering two arrangements between LHM and Au,two opposite resonant behaviors observed in p-reflectance spectra are analyzed in the angular interrogation mode and discussed thoroughly.

关键词： Confined electromagnetic modes surface plasmon resonance sensor left-handed material

Positron Energy Levels in Cd-Based Semiconductors

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Communications in Theoretical Physics 2013年第6期59卷 756-762页

作者： B.Abbar S.Mécabih S.Amari N.Benosman B.bouhafs Laboratoire de Modélisation et de Simulation en Sciences des Département de Physique Université Djillali Liabès

Using the full potential linearized augmented plane wave FP-LAPW method within local density ap-proximation LDA, we have studied positron diffusion and surface emission in Cd-based semiconductors. This requires the calculation of electron and positron band structures. In the absence of experimental and theoretical data for CdX (X=S,Se,Te) we have treated the Si, which has been studied by several authors, as a test case. Predictive results on positron effective masses, deformation potentials, positron work functions, diffusion constants and positron mobilities are presented for CdX (X=S, Se, Te). Our calculated data for Si are compared with experimental and recent theoretical results.

关键词： DFT FP-LAPW semiconductors positron diffusion

A Wireless Body Sensor Platform to Detect Progressive Deterioration in Musculoskeletal Systems

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Advances in Internet of Things 2013年第2期3卷 53-63页

作者： Paul Hanley Paul Fergus Faycal bouhafs School of Computing and Mathematical Sciences Liverpool John Moores University Liverpool UK

Recent developments in technology have helped to reduce the physical size and weight of devices and opened up new opportunities for their application in delivering unobtrusive healthcare services. In particular, kinetic and kinematic systems, that use sensors attached to the body, are currently being used to measure and understand many different aspects of human gait and behaviour. This has been particularly useful in treating stroke patients, rehabilitation, and understanding sedentary behaviour. Nonetheless, many of these systems are only capable of providing information about rudimentary movement rather than data on the mechanics of motion itself (tendons, ligaments and so on). Therefore, the information required by healthcare professionals to treat diseases like progressive deterioration of the musculoskeletal system, i.e. arthritis, cannot be determined. This paper discusses some of the technologies currently used to assess movement and posits a novel approach based on strain gauge technology to measure the constituent parts of a joint and its movement. In this way, the mechanics of motion can be studied and used to help detect and treat musculoskeletal diseases. A case study is presented to demonstrate the applicability of our approach.

关键词： Sensors Sensor Networks Networked Medical Devices Networked Appliances Home Networking Real-Time Monitoring Preventative Technologies High Precision Measurement

Structure and Bonding of Nanolayered Ternary Phosphides

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Materials Sciences and Applications 2011年第10期2卷 1383-1391页

作者： Abdelkader Yakoubi Hanane Mebtouche Mohamed Ameri Bachir bouhafs 不详

We have studied the electronic structure and chemical bonding mechanism of nanolayered M2SbP with M = Ti, Zr and Hf using the full-relativistic of an all-electron full potential linearized augmented-plane-wave (FP-LAPW) method based on the density functional theory, within the local density approximation scheme for the exchange-correlation potential. Furthermore, we have to calculate the energy of formation for prove the existence of these compounds experimentally. Geometrical optimizations of the unit cell are in good agreement with the available theoretical and experimental data. The bulk modulus of M2SbP conserved as Ti is replaced with Zr, and increases by 8.7% as Ti is replaced with Hf, which can be understood on the basis of the increased number of valence electrons filling the p-d hybridized bonding states. The bonding is of covalentionic nature with the presence of metallic character. Analyzing the bonding in the binary MP, it can be concluded that this character is essentially conserved in M2SbP ternaries.

关键词： Ceramics Ab-Initio Calculations Electronic Structure Crystal Structure Equations-of-State

First Principles Study of Structural and Electronic Properties of OxS1-xZn Ternary Alloy

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Materials Sciences and Applications 2013年第1期4卷 63-69页

作者： Mohammed Ameri Daho Salah Eddine Mokhtar Sebane Keltouma Boudia Yarub Al-Douri Ali Bentouaf Djelloul Hachemane Bachir bouhafs Amina Touia Department of Physics University of Djillali Liabes Sidi Bel-Abbes Algeria Institute of Nono Electronic Engineering University Malaysia Perlis Kangar Malaysia Modeling and Simulation Materials Sciences Laboratory Sidi-Bel-Abbès University Sidi Bel-Abbes Algeria

We perform self-consistent ab-initio calculations to study the structural and electronic properties of zinc blende ZnS, ZnO and their alloy. The full-potential muffin-tin orbitals (FP-LMTO) method was employed within density functional theory (DFT) based on local density Approximation (LDA), and generalized gradient approximation (GGA). We analyze composition effect on lattice constants, bulk modulus, band gap and effective mass of the electron. Using the approach of Zunger and coworkers, the microscopic origins of band gap bowing have been detailed and explained. Discussions will be given in comparison with results obtained with other available theoretical and experimental results.

关键词： FP-LMTO Ab-Initio Approach of Zunger Effective Mass