Ahmad Shuaib

• University of Engineering and Technology Lahore

The self-organization of a four-component partially ionized dusty plasma consisting of mobile electrons, positive ions, neutrals, and negatively charged static dust particles into a non-force-free double Beltrami (DB) state is explored. The DB state is a linear superposition of two distinct single Beltrami fields, characterized by two self-organize...

In this study, the cyclic trimer of hexachlorocyclotriphosphazene (HCCP) was used as the starting material for the thermal ring opening polymerization (T-ROP) method, which was followed by a macromolecular substitution reaction to create three Polyphosphazene derivatives with aromatic side groups. FTIR, 1HNMR, 31PNMR, DSC, elemental analysis, and g...

ZnO is an important semiconductor due to its unique structural, mechanical and optical properties. In this study pure ZnO pallets and Co3O4 doped ZnO pallets with varying molar concentration of dopant i.e 2% 4% 6% 8% and 10% were prepared by using hydraulic press. X-ray diffraction (XRD), FTIR and Vickers indentation method is used for pallets char...

Multiferroic solid solution of (Ba0.85Ca0.15) (Zr0.1Ti0.9)O3, and BiFeO3, with stoichiometry 1−x(0.98BCZT-0.02BFO)xCuO; (0.0 ≤ x ≤ 4.0 wt %) were prepared via mixed oxide solid-state reaction (MOSSR) route sintered at 1075 °C. All samples were analyzed by X-ray diffraction, Fourier transform infrared spectrometer, field emission scanning electron m...

The current research reports a facile and cost-effective technique for the deposition of functional ceramics Bi0.5Na0.5TiO3 thick films on flexible, low cost, electrically integrateable Ni substrate by using electrophoretic deposition (EPD) technique. EPD is a well-known, eco-friendly process for depositing coatings on a conductive substrate from a...

A possibility of self‐organization of magnetized four‐component dusty plasmas to double Beltrami (DB) state is explored. It is found that for a specific set of Beltrami parameters, the four‐component dusty plasma self‐organizes to DB state. The DB state characterized by two scale parameters may represent a paramagnetic or diamagnetic field structur...

In the recent times, fabrication of metallic nanoparticles has become an enthralling area of research in the field of materials science. Among all, silver nanoparticles have taken the position of talented candidate for the modern study because of their efficient applications in biomedical field. Various chemical and physical routs have been explore...

An extensive research has been carried out in synthesizing and characterizing single and double layer metal thin films of different thicknesses including ultrathin films. We discuss the experimental data of surface plasmon resonance (SPR) occurring at the interface between air, single and bimetallic thin layers of gold (Au) and silver (Ag) prepared...

Graphene has become a worldwide admired material among researchers and scientists equally due to its unique richness in mechanical strength, electrical conductivity, optical and thermal properties. Researchers have explored that the composite materials based on graphene and metal/metal oxide nanostructures possess excellent potential for energy sto...

The present work reports an electrical investigation of silver plasma using a self-fabricated Langmuir probe in air and under a low vacuum (∼10-3 torr). A silver target was irradiated with a Q-switched Nd:YAG laser with the wavelength 1.064 m, energy 10 mJ, pulse duration 9-14 ns and power 1.1 MW. The collective behavior of a silver plasma plume is...

Graphene has become a worldwide admired material among researchers and scientists equally due to its unique richness in mechanical strength, electrical conductivity, optical and thermal properties. Researchers have explored that the composite materials based on graphene and metal/metal oxide nanostructures possess excellent potential for energy sto...

It is shown that there exists a strong interaction between the magnetic and kinetic aspects of a multi-ion plasma. The interaction appears as a system of simultaneous equations which show the alignment of vortices to flows and satisfy the Beltrami condition. Solving these equations lead to a non-force-free magnetic field which can be cast as a supe...

Polarization controlled quantum dashes (QDHs) Vertical Cavity Surface Emitting Lasers (VCSELs) emitting at 1.6 µm grown on InP(001) are investigated and compared with a quantum well (QW) similar VCSEL. Polarization stability of optically-pumped VCSELs under a low frequency modulation is investigated. While major fluctuations of the polarization-res...

A 1.55 μm emitting tunable vertical cavity surface emitting laser (VCSEL) is fabricated, using an intracavity nematic liquid crystal layer. Half cavity VCSEL are realized on InP(001), based on quantum wells associated with broadband dielectric mirror, following by the insertion of a 3 μm thick liquid crystal layer in the cavity. Room temperature la...

A tunable vertical-cavity surface-emitting laser is fabricated where tunability is achieved with an intracavity layer of nematic liquid crystal and gain is provided by a semiconductor quantum well structure. The anisotropic liquid crystal layer enables a continuously tunable single-mode emission along the extraordinary axis of the layer. Polarizati...

A tunable VCSEL is demonstrated, where tunability is achieved with an intracavity nematic liquid crystal layer. Laser effect is obtained under optical pumping. By choosing an adequate cavity length, it is possible to obtain a single mode emission on the extraordinary mode. A tuning range of more than 30 nm is demonstrated, with an applied voltage o...

Nous proposons ici l'étude des propriétés dynamiques de la polarisation d'un VCSEL (Laser vertical à émission par la surface) à fils quantiques (FQs) InAs/InP, émettant à 1,6 µm. La stabilité de la polarisation en régime dynamique est analysée et comparée à celle des VCSELs à base de puits quantiques (PQs). Tandis qu'on observe de fortes fluctuatio...

Les performances dynamiques des lasers à émission verticale (VCSELs) émettant aux longueurs d'ondes des télécommunications optiques (1.55 µm), et constitués de puits quantiques (PQs) ou de fils quantiques (FQs) sont analysées et comparées. La polarisation optique des VCSELs à PQs apparaît très instable, et peu prédictible. A l'inverse, les VCSELs à...

Polarization controlled quantum dashes (QDHs) VCSEL grown on InP are investigated. Using optimized growth conditions, QDHs are obtained, presenting a polarized photoluminescence at 1.55 µm at room temperature, following the [1-10] direction according to QDH length. VCSEL polarized output laser emission is demonstrated at room temperature. Output VC...