Showing papers by "Qaisar Abbas Naqvi published in 2022"

Magnetic and fractional parametric control of Goos-Hänchen shifts in the anisotropic yttrium-iron-garnet film surrounded by isotropic fractal dielectric half-spaces

Abstract: This article focuses on the controllability of reflected and transmitted Goos-Hänchen shifts for a planar anisotropic yttrium-iron-garnet film. The yttrium-iron-garnet film, being magneto-optical material, is magnetized along the z-direction. For richer control of the Goos-Hänchen shifts and the characteristics of reflectivity/transmitivity, the externally magnetized film is surrounded by isotropic fractal dielectric half-spaces. The tuning of Goos-Hänchen shifts from positive to negative and vice versa, has been obtained by varying the values of incidence frequency in the microwave regime, incidence angle, fractional dimensional parameter, external magnetic field, and slab thickness. • Goos-Hanchen Shifts for anisotropic yttrium-iron-garnet film for parallel/perpendicular polarization have been studied. • For richer control on the Goos-Hanchen Shifts, the magnetized film is surrounded by isotropic fractal dielectric half-spaces. • Goos-Hanchen Shifts have been tuned by the external magnetic field and NID parameter of fractal media.

Analysis of Goos H{\"a}nchen Shift from an Orthorhombic Anisotropic Slab with/without Topologically Insulating Surface States

Abstract: A Goos–Hänchen shift (GHS) due to an orthorhombic biaxial slab with/without topological conducting states placed in isotropic media was investigated. The effect of varying host media, changing topological conducting states, and left/right asymmetries on the co/cross-polarized reflection coefficients and the corresponding GHS was investigated. Numerical calculations revealed that large negative/positive GHS occurs near the reflectance dips (local reflectance minimum) due to sudden changes in the amplitude of the reflection coefficient. Position and amplitude of the GHS near these reflectance dips are affected by anisotropy and surface admittance. Furthermore, numerical calculations also revealed that the GHS is left/right symmetric for an orthorhombic biaxial slab with/without topological conducting states. However, if the optic axes of a slab with/without a topological conducting state are rotated along any direction, the resulting GHS becomes left/right asymmetric.

Tunable Dispersive Wave Generation for High Power Supercontinuum Coverage in the Mid-IR and Far-IR Regions

Abstract: A dual-core coupled silicon-rich nitride waveguide pumped at telecom wavelength, allowing more power-efficient conversion and dispersive wave engineering in the mid-infrared region up to 7μm wavelength by simulations is demonstrated.

Tunable Goos Hänchen shift at an isotropic fractal dielectric and uniaxial chiral interface

Abstract: In this article, the reflection properties of the plane wave incident at isotropic fractal dielectricanisotropic chiral interface have been demonstrated. The properties of the reflected wave have been discussed explicitly as a function of field parameter Ω = { θi, ε, κ, ζ } . The Goos Hänchen Shift in the reflected wave from the said interface has also been predicted based on the stationary phase method. Furthermore, for the sake of tuning the Goos Hänchen Shift, the impact of field parameter Ω has also been scrutinized and agreement with the results already presented in literature has been obtained..