Showing papers by "Qaisar Abbas Naqvi published in 2021"
TL;DR: In this paper, the impact of NID and/or TI on the GHS of the reflected waves have also been studied and compared with the existing cases, using an existing mathematical formulation accommodating both models.
13 citations
TL;DR: In this article, the behavior of reflection coefficient, corresponding phase, and the Goos-Hanchen effect for near zero-index metamaterials taking fractional dual fields as the source of excitation was examined.
9 citations
TL;DR: In this article, the saddle point method of integration is used to obtain an expression for the far-zone scattered field, which is then compared with corresponding results obtained through the physical optics method.
Abstract: Kobayashi potential method is applied to get the scattering behavior by a perfect electromagnetic conducting strip deeply buried underneath a flat dielectric slab. Using the two-dimensional solution of homogeneous Helmholtz’s equation, Fourier transformed representation of scattered field is written in terms of the unknown characteristic functions. Application of the boundary conditions on tangential components of electromagnetic fields gives dual integral equations (DIEs) which through Weber–Schafheitlin’s discontinuous integrals and Jacobi polynomials are used to satisfy the edge condition. The resulting DIEs are written in matrix equations, and those that involve infinite integrals are computed numerically. The saddle point method of integration is used to obtain an expression for the far-zone scattered field. To validate the results, obtained results are firstly compared with corresponding obtained through the physical optics method. The width of the strip, the thickness of the slab, and the angle of incidence of plane wave are taken as parameters to study their influence on the scattered field.
4 citations
TL;DR: In this paper, the influence of variation of NID parameters on the reflection/ transmission coefficient and GH shift is examined for an epsilon-near-zero (ENZ) slab, sandwiched between two different non-integer dimensional (NID) media, considering a plane wave as the source of excitation is presented.
4 citations
TL;DR: In this paper, the Imbert-Fedorov shift for a planar interface of ordinary dielectric/non-integer dimensional-chiral/chiral chiral/noninteger dimensional chiral media is theoretically investigated.
3 citations
TL;DR: In this paper, a spherical dielectric nanoparticle enclosed by a uniform shell of the inhomogeneous chiral medium was analyzed in terms of the effective permittivity of the nanoparticle.
2 citations
1 citations
TL;DR: In this article, the polarizability response of a nano-size spherical geometry is studied under the quasi-static approximation, where the spherical geometry consists of an electrically radially anisotropic chiral sphere with dispersive chiral coating and is placed in an unbounded lossless isotropic chiral medium.
TL;DR: Wavevector planes for media with open and closed IFCs are investigated with an aim to further differentiate them into regions supporting distinct electromagnetic modes, orientation of power, wavevector, and positive-negative phase velocities.
Abstract: Interaction of light and matter can be controlled and manipulated by exploiting the properties of the isofrequency contours (IFCs) of a material. IFC in metamaterial/artificial anisotropic materials can be open and/or closed. The class of metamaterials with open IFC are known as hyperbolic metamaterials (HMMs)/indefinite media. HMMs support large wavevectors, which can lead to some important consequences, such as energy transfer (long range), metacavity lasers (subwavelength scale), sensors (high sensitivity), and hyperlenses (surpassing diffraction limit). Therefore, in this paper wavevector planes for media with open and closed IFCs are investigated with an aim to further differentiate them into regions supporting distinct electromagnetic modes, orientation of power, wavevector, and positive-negative phase velocities.
TL;DR: In this paper, the gain properties of an axially slotted cylindrical antenna coated with eccentric layer of inhomogeneous material placed in different metamaterials have been investigated.