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Birefringence via Doppler broadening and prevention of information hacking

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Chinese Physics B 2018年第1期27卷 365-370页

作者： Humayun Khan muhammad haneef Bakhtawar Laborotary of Theoretical Physics Department of Physics Hazara University

We propose a new scheme for the coherent control of birefringent light pulses propagation in a four-level atomic medium. We modify the splitting of a light pulse by controlling the electric and magnetic responses. The Doppler broad- ening effect is also noted on the propagation of the birefringent pulses. The dispersions of the birefringence beams are oppositely manipulated for delay and advancement of time at a Doppler width of 10Y. A time gap is created between the birefringence beams, which protects from hacking of information. The time gap is then closed to restore the pulse into the original form by a reverse manipulation of the dispersion of the birefringence beams, i.e., introducing another medium whose transfer function is the complex conjugate of that of the original medium. The results are useful for secure communication technology.

关键词： birefringence Doppler broadening time gap hacking

Space–time cloaks through birefringent Goos–H?nchen shifts

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Chinese Optics Letters 2019年第3期17卷 80-85页

作者： Humayun Khan muhammad haneef Bakhtawar Laboratory of Theoretical Physics Department of Physics Hazara University Mansehra Department of Physics Women University Mardan

We report a theoretical demonstration for the creation of space–time holes based on birefringence of reflection,transmission, and the Goos–H?chen(GH) shifts from a chiral medium. We observed space–time holes in the reflection, transmission, and their corresponding GH-shifted beams. Two space–time holes are clearly detected in the regions of 0 < t ≤ 5τ_0 and-5 w ≤ y ≤ 5 w, as well as in the regions of-5τ_0≤ t ≤ 0 and-5 w ≤ y ≤ 5 *** space–time holes hide objects and information contents from observers and hackers. The objects and information contents are completely undetectable, and thus events can be cloaked. The results of this paper have potential applications in the invisibility of drone technology and secure communication of information in telecom industries.

关键词： Goos can be

Surface plasmon polariton at the interface of dielectric and graphene medium using Kerr effect

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Chinese Physics B 2018年第11期27卷 522-527页

作者： Bakhtawar muhammad haneef B A Bacha H Khan M Atif Lab of Theoretical Physics Department of Physics Hazara University Department of Physics University of Malakand

We theoretically investigate the control of surface plasmon polariton（SPP） generated at the interface of dielectric and graphene medium under Kerr nonlinearity. The controlled Kerr nonlinear signal of probe light beam in a dielectric medium is used to generate SPPs at the interface of dielectric and graphene medium. The positive, negative absorption, and dispersion properties of SPPs are modified and controlled by the control and Kerr fields. A large amplification（negative absorption） is noted for SPPs under the Kerr nonlinearity. The normal/anomalous slope of dispersion and propagation length of SPPs is modified and controlled with Kerr nonlinearity. This leads to significant variation in slow and fast SPP propagation. The controlled slow and fast SPP propagation may predict significant applications in nano-photonics, optical tweezers, photovoltaic devices, plasmonster, and sensing technology.

关键词： surface plasmon polariton Kerr nonlinearity graphene

Efficient two-dimensional atom localization in a five-level conductive chiral atomic medium via birefringence beam absorption spectrum

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Communications in Theoretical Physics 2021年第1期73卷 25-34页

作者： Sajid Ali muhammad Idrees Bakth Amin Bacha Arif Ullah muhammad haneef Lab of Theoretical Physics Department of PhysicsHazara UniversityMansehra 21300Pakistan Quantum Optics and Quantum Information Research Group Department of PhysicsUniversity of MalakandChakdara Dir(L)Khyber PakhtunkhwaPakistan Zhejiang Province Key Laboratory of Quantum Technology and Device Department of PhysicsZhejiang UniversityHangzhou 310027China

We have theoretically investigated two-dimensional atom localization using the absorption spectra of birefringence beams of light in a single wavelength *** atom localization is controlled and modified through tunneling effect in a conductive chiral atomic medium with absorption spectra of birefringent *** significant localization peaks are investigated in the left and right circularly polarized *** and double localized peaks are observed in different quadrants with minimum uncertainty and significant *** localized probability is modified by controlling birefringence and tunneling *** results may be useful for the capability of optical microscopy and atom imaging.

关键词： 2D atom localization birefringence beam absorption chiral atomic medium

Surface Plasmon Polariton Fizeaus Dragging: via Relative Rotational Sensing

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Communications in Theoretical Physics 2019年第4期71卷 435-440页

作者： Bilal Shoaib muhammad haneef Humayun Khan Bakhtawar Lab of Theoretical Physics Department of Physics Hazara University Department of Physics Women UniversityMardan

A new scheme focusing on the surface plasmon polariton interferometry between the metal and dielectric interface is introduced. The phase shift is measured by using surface plasmon polariton wave, generated at the interface of metallic and dielectric media. The phase shift of SPPs is modi?ed under phase and amplitude control of complex conductivity for interferometry. The control ?elds strongly in?uence the phase shift of SPPs for detection of molecular motion. The phase shift of SPPs is further modi?ed by Plasmon polariton Fizeaus dragging effect. We measure 20%–25%fractional change in delay and their phases shift between two left and right SPPs modes. Our results may have signi?cant applications in sensor interferometer technology.

关键词： surface plasmon polariton Fizeaus dragging

Detached Electron Spectra from H- near a Partially Reflecting Spherical Surface

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Chinese Physics Letters 2012年第7期29卷 80-83页

作者： muhammad haneef Saleh Mohammad Jehan Akbar Suneela Arif muhammad Zahir Humayun Khan Department of Physics Hazara UniversityGarden CampusMansehraPakistan Department of Statistics University of PeshwarPakistan

The photodetachnent of a hydrogen negative ion (H-) near a partially reflecting surface with a spherical shape is investigated by a theoretical imaging *** expressions for the detached electron flux and total photodetachment cross section are *** is found that two parameters,*** radius Tc and reflection parameter K,control the photodetachment ***,these parameters can be used for the classification,identification and revelation of minor details like curvature of different types of surfaces.

关键词： curvature Electron details

The Effects of Spherical Surface and Laser Polarization on the Photodetachment Cross Section of H^-

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Communications in Theoretical Physics 2013年第3期59卷 356-360页

作者： muhammad haneef Suneela Arif Jehan Akbar Nasrullah Shah muhammad Zahir Aneela Shamim Hameed Ullah Lab of Atom and Quantum Interference Department of PhysicsHazara UniversityGarden CampusMansehraPakistan Department of Chemistry Abdul Wali Khan UniversityMardanPakistan Department of Statistics University of PeshawarPakistan Department of Chemistry Hazara UniversityGarden CampusMansehraPakistan

We report the combined effects of laser polarization and curvature of the spherical surface on the detached electron spectra from H-. The Theoretical imaging method is used as a tool of investigation. The photodetachment cross sections for various polaxization angles, radii of curvatures and inter ion surface distances axe displayed. The analysis of the spectra reveals that the laser polarization angle θL, curvature of the surface τc and inter ion surface distance d strongly affect oscillations in the spectra. Therefore, a fine control on the laser polaxization and that of curvature in the surface can be used to control oscillations in the photodetachment of negative ions.

关键词： negative ions photodetachment spherical surface

Photodetachment of Di-atomic Negative Ion H^(-)_(2) near a Surface

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Chinese Physics Letters 2012年第5期29卷 89-92页

作者： muhammad haneef Saleh Mohammad Suneela Arif Jehan Akbar Nasrullah Shah Imran Ullah Department of Physics Hazara UniversityGarden CampusMansehraPakistan Department of Chemistry Abdul Wali Khan UniversityMardanPakistan

We describe the effects of plane surface on the photo-detached electron spectra from H^(-)_(2).A z-polarized laser is used for the detachment of *** detached electron flux and photodetachment cross section are *** exists strong dependence on the distance of the H^(-)_(2) from the surface and also on the separation of atomic centers of H^(-)_(2).The results show strong oscillations for smaller values of distances,whereas for larger values the oscillating structure disappears.

关键词： atomic oscillating separation

Visual News Ticker Surveillance Approach from Arabic Broadcast Streams

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Computers, Materials & Continua 2023年第3期74卷 6177-6193页

作者： Moeen Tayyab Ayyaz Hussain Usama Mir M.Aqeel Iqbal muhammad haneef Department of Computer Science and Software Engineering International Islamic UniversityIslamabad44000Pakistan Department of Computer Science Quaid-i-Azam UniversityIslamabad44000Pakistan Department of Computer Science Senior Member IEEEUniversity of WindsorN9B 3P4Canada Department of Software Engineering Foundation University IslamabadIslamabad44000Pakistan Department of Electrical Engineering Foundation University IslamabadIslamabad44000Pakistan

The news ticker is a common feature of many different news networks that display headlines and other *** ticker recognition applications are highly valuable in e-business and news surveillance for media regulatory *** this paper,we focus on the automatic Arabic Ticker Recognition system for the Al-Ekhbariya news *** primary emphasis of this research is on ticker recognition methods and storage *** that end,the research is aimed at character-wise explicit segmentation using a semantic segmentation technique and words identification *** proposed learning architecture considers the grouping of homogeneousshaped *** incorporates linguistic taxonomy in a unified manner to address the imbalance in data distribution which leads to individual ***,experiments with a novel ArabicNews Ticker(Al-ENT)dataset that provides accurate character-level and character components-level labeling to evaluate the effectiveness of the suggested *** proposed method attains 96.5%,outperforming the current state-of-the-art technique by 8.5%.The study reveals that our strategy improves the performance of lowrepresentation correlated character classes.

关键词： Arabic text recognition optical character recognition deep convolutional network SegNet LeNet