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Murtaza Saleem,Shahid Atiq,Shahzad Naseem,Saadat A. Siddiqi 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.60 No.10
Synthesis techniques strongly influence the various properties of diluted magnetic semiconductor materials. Auto-combustion and co-precipitation techniques were employed to prepare Zn0.95Ni0.05O samples. X-ray diffraction studies exhibited a phase with a pure wurtzite-type crystal structure in both samples. However, traces of nickel oxide were detected in the sample synthesized with the coprecipitation technique. The structural morphology was studied with scanning electron microscopy. Energy dispersive X-ray analysis confirmed the incorporation of Ni content into the zinc-oxide matrix. The decrease in resistivity with increasing temperature demonstrated a typical semiconducting behavior. Room-temperature ferromagnetism was detected only in the sample synthesized with the auto-combustion technique.
Enhanced Magnetic Moment of Epitaxial Υ´-Fe<sub>4</sub>N Films at Low Temperature
Shahid Atiq,Murtaza Saleem,Shahid M. Ramay,Saadat A. Siddiqi,M. Sabieh Anwar,신성철 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.60 No.10
Ferromagnetic iron nitride has fascinated the researchers owing to its amazing magnetic properties for spintronic applications. We have prepared single phase epitaxial thin films of Υ´-Fe<sub>4</sub>N on single crystal MgO(100) substrates using dc magnetron sputtering. X-ray diffraction revealed that substrate temperature and annealing time were most important parameters for single phase epitaxial growth of the films. Atomic force microscopy and scanning electron microscopy were utilized to investigate the surface morphology of the films. Angle dependent magnetic anisotropy was observed in epitaxial thin films of Υ´-Fe<sub>4</sub>N. A superconducting interference device was utilized to explore the magnetic and electrical behavior of Υ´-Fe<sub>4</sub>N films at low temperatures.
Dielectric Meta-Holograms Enabled with Dual Magnetic Resonances in Visible Light
Li, Zile,Kim, Inki,Zhang, Lei,Mehmood, Muhammad Q.,Anwar, Muhammad S.,Saleem, Murtaza,Lee, Dasol,Nam, Ki Tae,Zhang, Shuang,Luk’yanchuk, Boris,Wang, Yu,Zheng, Guoxing,Rho, Junsuk,Qiu, Cheng-Wei American Chemical Society 2017 ACS NANO Vol.11 No.9
<P>Efficient transmission-type meta-holograms have been demonstrated using high-index dielectric nanostructures based on Huygens principle. It is crucial that the geometry size of building blocks be judiciously optimized individually for spectral overlap of electric and magnetic dipoles. In contrast, reflection-type meta-holograms using the metal/insulator/metal scheme and geometric phase can be readily achieved with high efficiency and small thickness. Here, we demonstrate a general platform for design of dual magnetic resonance based meta-holograms based on the geometric phase using silicon nanostructures that are quarter wavelength thick for visible light. Significantly, the projected holographic image can be unambiguously observed without a receiving screen even under the illumination of natural light. Within the well-developed semiconductor industry, our ultrathin magnetic resonance-based meta-holograms may have promising applications in anticounterfeiting and information security.</P>
Optical Spectroscopic Analysis Techniques to Detect Elemental Profile of Human Teeth Dentine
Saifullah Jamali,Muhammad Aslam Khoso,Irfan Ali Sanjrani,Hussain Saleem,Tariq Ali Siyal,Muhammad Ashraf,Mansoor Ahmed Memon,Ghulam Murtaza,Zahid Hussain Arain,Zaheer Ahmed Ujjan,Muhammad Niaz Laghari International Journal of Computer ScienceNetwork S 2023 International journal of computer science and netw Vol.23 No.3
Numerous articles under the study and the examination of heavy metals in human teeth have been published in recent years. The heavy metal poisoning is a widespread issue emerged in toxicology area these days. It has been discovered that long-term exposure to heavy metals typically present in traces, in our everyday meals, drinking water, and in the environment as pollution causes heavy metal poisoning in human beings. Industrial effluents, Coal and Oil, as well as a variety of consumer items, such as cosmetics, can all cause this type of exposure. Teeth, which are often thought of as exoskeleton parts, store heavy metals with a high affinity and represent long-term exposure information. In this study, we have chosen and examined the sections of dentine instead, then examined the entire tooth. We have combined the work done on the examination of heavy metals in human teeth using several instrumental approaches e.g. "Optical Spectroscopic Techniques" to detect elemental profile of human teeth in the current study.
Twisted non-diffracting beams through all dielectric meta-axicons
Mahmood, Nasir,Jeong, Heonyeong,Kim, Inki,Mehmood, Muhammad Qasim,Zubair, Muhammad,Akbar, Ali,Saleem, Murtaza,Anwar, Muhammad Sabieh,Tahir, Farooq Ahmad,Rho, Junsuk The Royal Society of Chemistry 2019 Nanoscale Vol.11 No.43
<P>We demonstrate transmission-based all-dielectric, highly efficient (≈73.4%) and polarization-insensitive meta-axicons (for the visible wavelength of 633 nm) to generate zero and higher order Bessel beams without using additional components. The Bessel beams, owing to their diverse applications and non-diffractive properties, attract great interest from the scientific community. It is shown that the propagation length can be increased through a lower numerical aperture (∼2600 <I>λ</I> for NA = 0.1) whereas a higher full width at half maximum (< 0.5 <I>λ</I>) can be obtained for a higher numerical aperture (for NA ≥ 0.7). Our dielectric material, hydrogenated amorphous silicon (a-Si:H), provides a significant efficiency advantage over plasmonic and other high-index all-dielectric (<I>e.g.</I>, TiO2 and GaN) metasurfaces in terms of cost, ease of fabrication, and CMOS compatibility. The finite difference time domain (FDTD) technique based numerically simulated and experimental results show excellent agreement. Due to the technological and scientific importance of the Bessel beams, the recommended material and meta-axicons provide an efficient and compact platform for realizing various advanced applications like optical manipulation, optical alignment, laser fabrication, imaging, and laser machining.</P>
Polarisation insensitive multifunctional metasurfaces based on all-dielectric nanowaveguides
Mahmood, Nasir,Kim, Inki,Mehmood, Muhammad Qasim,Jeong, Heonyeong,Akbar, Ali,Lee, Dasol,Saleem, Murtaza,Zubair, Muhammad,Anwar, Muhammad Sabieh,Tahir, Farooq Ahmad,Rho, Junsuk The Royal Society of Chemistry 2018 Nanoscale Vol.10 No.38
<P>Metasurfaces, two dimensional (2D) metamaterials comprised of subwavelength features, can be used to tailor the amplitude, phase and polarisation of an incident electromagnetic wave propagating at an interface. Though many novel metasurfaces have been explored, the hunt for cost-effective, highly efficient, low-loss and polarisation insensitive applications is ongoing. In this work, we utilise an efficient and cost-effective dielectric material, hydrogenated amorphous silicon (a-Si:H), to create a ultra-thin transmissive surface that simultaneously controls phase. This material exhibits significantly lower absorption in the visible regime compared to standard amorphous silicon, making it an ideal candidate for various on-chip applications. Our proposed design, which works on the principle of index waveguiding, integrates two distinct phase profiles, that of a lens and of a helical beam, and is versatile due to its polarisation-insensitivity. We show how this metasurface can lead to highly concentrated optical vortices in the visible domain, whose focused ring-shaped profiles carry orbital angular momentum at the miniaturised scale.</P>