Yazar "Bacha, Bakht Amin" seçeneğine göre listele

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    Coherent manipulation of giant birefringent Goos-Hänchen shifts by compton scattering using chiral atomic medium
    (Nature Portfolio, 2024) Haq, Zia Ul; Ahmad, Iftikhar; Bacha, Bakht Amin; Akguel, Ali; Hassani, Murad Khan
    A four level chiral medium is considered to analyze and investigate theoretically the reflection/transmission coefficients of right circularly polarized (RCP) beam and left circularly polarized (LCP) beam as well as their corresponding GH-shifts under the effect of compton scattering. Density matrix formalism is used for calculation of electric and magnetic probe fields coherence. The polarization and magnetization are calculated from probes coherence terms in the chiral medium. The electric and magnetic susceptibilities as well as chiral coefficients are related with polarization and magnetization. The refractive indices of RCP and LCP beams under compton scattering effect is modified from the electric/magnetic susceptibilities, chiral coefficients, mass and charge of electron as well as compton scattering angle. The giant positive and negative birefringent Goos-H & auml;nchen (GH) shifts in reflection and transmission beams are investigated in this manuscript under Compton scattering effect. The RCP and LCP beams obey the normalization condition |R(+,-)|+|T(+,-)|=1\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$|R<^>{(+,-)}|+|T<^>{(+,-)}|=1$$\end{document} at the interface of a lossy chiral medium of |A(+,-)|similar or equal to 0\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$|A<^>{(+,-)}|\simeq 0$$\end{document} and a thin sheet of balsa wood under the effect of compton scattering angle, incident angle, probe field detuning, control field Rabi frequency, phases of electric and magnetic fields and phase of superposition states. Significant positive/negative giant GH-shifts in reflection and transmission beams are investigated. The results show potential applications in modification of cloaking devices, image coding, polarizing filters and LCD displays.
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    Öğe
    Manipulation of sensitivity of the surface plasmon polariton waves at the interface of high magneto-optical medium and silver metal using angular interrogation
    (Elsevier, 2023) Khan, Qaisar; Bacha, Bakht Amin; Ahmad, Iftikhar; Khan, Majid; Akgul, Ali; EI Din, Sayed M.; Khesro, Amir
    In this manuscript, sensitivity of the surface plasmon polariton waves (SPPs) using angular interrogation is coherently manipulated at the interface of four level high magneto-optical medium and silver metal using prism geometry. The control and probe fields detuning, Rabi frequency and decay rate manipulated significantly the angular interrogation of sensitivity of the surface plasmon polariton waves. The permittivity d and permeability ?d of the high magneto-optical medium play an important role in the manipulation of the sensitivity. The sensitivity is a function of control field detuning. The maximum sensitivity is reported to 800 deg/RIU with control field detuning. The minimum sensitivity is investigated to 6 deg/RIU with probe field detuning and Rabi frequency of control field. The reported results have useful applications in data storage and chemical sensing technologies.
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    Öğe
    Parity time symmetry in two dimensional chiral optical lattice, via positive and negative refraction
    (Elsevier, 2024) Hayat, Umar; Bacha, Bakht Amin; Din, Rafi Ud; Ahmad, Iftikhar; Akgul, Ali; El Din, Sayed M.
    The parity time symmetry and positive/negative refraction is investigated in chiral optical lattice. Significant parity time symmetry is reported in five level chiral optical lattice which satisfied the conditions Re(n(r)((+/-))(x,y)) = Re(n(r)(*(+/-))(-x, -y) and Im(n(r)((+/-)) (x, y)) = -I m(n(r)*((+/-)) (-x, -y) for left and right circularly polarized beams. The related group indices, phase shifts and divergent angle are also satisfied the parity time symmetry conditions n(g) ((+/-)) (x, y)) = n(g)*((+/-)) (-x, -y) phi((+/-)) (-x, -y)) = phi*((+/-)) (-x, -y) and theta(d,g)* (-x, -y) for left and right circularly polarized beams. Maximum negative group index is calculated to -25000. The maximum phase and group divergent angles are reported to 0.001 radian and -0.9 radian. The phase shifts in LCP and RCP beams are investigated to +/- 0.004 radian at a length L = 10 lambda. The modified results have potential application in nanotechnology.
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    Öğe
    Topological localized region of Goos-Hanchen shifts in reflection and transmission
    (Elsevier, 2023) Khan, Aizaz; Mahmoud, Emad E.; Ahmad, Iftikhar; El Din, Sayed M.; Bacha, Bakht Amin; Akgul, Ali
    In this manuscript, the Goos-Hanchen shift of the transmitted and reflected probe beam is controlled and modified. Topologically localized regions are reported in the G-H shift by introducing the position and orbital angular momentum dependency in the Rabi frequencies of the control fields. The system parameters along with the azimuthal quantum number are used to control and modify G-H shift as well as the topological regions. Crater and peak type topological regions are reported in the G-H shift of the reflected as well as transmitted beam. The number of localized regions are reported to strictly follow the general formula 2l2. The maximum shift in the reflected spectrum is reported to be Sr/.1 = -140, where as in the transmitted spectrum it is only S1.1 = -15. The modified results might have significant applications in optical waveguide switches and sensors.