Aqeel A. Syed

Electromagnetic Fields in a Circular Waveguide Containing Chiral Nihility Metamaterial

Propagation of electromagnetic flelds and power in a circular waveguide containing chiral nihility metamaterial is studied. Space inside the waveguide is divided into two circular regions. One region contains chiral nihility metamaterial while other region is of free space. Two cases of the waveguide, in this regard, are considered for analysis. For the case of perfect electric conductor (PEC) waveguide, there is no net electric fleld and power propagation in chiral nihility region of the guide whereas both flelds and power exist in non- nihility region (which is free space in our cases) of the guide. For perfect electromagnetic conductor (PEMC) waveguide, both electric and magnetic flelds exist in the chiral nihility and non-nihility regions.

Fields in fractional dual DB waveguides containing chiral nihility metamaterials

A fractional curl operator is used to derive fields for guided waves in a three-layered fractional dual planar waveguide with DB boundary, i.e. the normal components of electric flux density D and magnetic flux density B become zero at the interface. The middle layer of the waveguide is filled with air and the other two layers are filled by chiral nihility metamaterial. For the purpose of solution, a general wave propagating inside the waveguide is assumed and decomposed into transverse electric and transverse magnetic modes. It is noted that fields do exist in chiral nihility material backed by DB. Moreover, it is noted that only co-polarized wave is reflected back from DB interface of the waveguide. In the core of DB waveguide, filled with air, we get circular wave behavior of fields.

Radiation Characteristics of Elementary Sources Located in Unbounded Chiral Nihility Metamaterial

Radiation characteristics of an electric dipole located in unbounded chiral nihility metamaterial are studied. For this purpose, expressions for radiated electric and magnetic fields due to electric dipole are derived in terms of cylindrical wave functions using the vector potentials. It is noted that electric dipole radiates no electric field whereas there is nonzero radiated magnetic field in the chiral nihility medium.

Scattering of electromagnetic plane wave from a chiral cylinder placed in chiral metamaterials

Abstract Analytical solution of vector wave equation describing the scattering of electromagnetic plane waves from an infinitely long circular chiral cylinder placed in another chiral metamaterial is presented. Cylindrical vector wave functions are used to express the fields both inside and outside the circular cylinder. The unknown are determined by applying the appropriate boundary conditions at the cylindrical interface. The numeric results are presented taking different combinations of metamaterials for inner and outer mediums of the cylinder. For this purpose chiral and/or chiral nihility cylinder placed in chiral and/or chiral nihility mediums are considered. Extreme cases of permittivity and permeability corresponding to PEC and PMC cylinder are also considered.

CHIRAL AND/OR CHIRAL NIHILITY INTERFACES: PARAMETRIC DEPENDENCE, POWER TUNNELING AND REJECTION

Characteristics of re∞ected power from a planar interface of chiral and/or chiral nihility media have been investigated theoretically. Focus of the study is tunneling and rejection of power associated with these interfaces. Efiect of polarization of incidence fleld and parametric dependence on re∞ected power have been noted. It is found from numerical results that power tunneling and rejection have strong dependency on the polarization of incidence fleld, angle of incidence, and chirality parameter.

Electromagnetic Response of a Circular dB Cylinder in the Presence of Chiral and Chiral Nihility Metamaterials

Scattering of electromagnetic plane wave from an inflnitely long circular DB cylinder placed in chiral and chiral nihility metamaterials is studied, and the results are compared with that of scattering from DB cylinder placed in free space. The discussion is further extended by considering coating of DB cylinder with chiral/chiral nihility metamaterial. For DB cylinder placed in unbounded free space/chiral/chiral nihility metamterial, only co- polarized scattered flelds are obtained, whereas, for chiral/chiral nihility metamaterial coated case, both co- and cross-polarized scattered flelds are noted. Numerical results are presented for difierent values of chirality parameter.

Quasi-static analysis of scattering from a layered plasmonic sphere in fractional space

Quasi-static analysis of scattering from a layered sphere in fractional dimensional space is presented. The layers to be considered include plasmonic and/or non-plasmonic materials. Additionally, the space surrounding and occupied by the sphere is assumed to be fractional. The effects of layers and fractionality of dimensions on polarizability and potential distribution of the sphere are investigated. Numerical results for the same are presented for various combinations of layers and fractionality of the space.

The effects on waves in silver metal due to L-nihility

Abstract This article reports the studies of the effect on waves propagating in silver metal due to L-nihility . For this purpose, a plane wave is considered to be incident from air to half space of silver metal (), and the response of metal is observed at the L-nihility frequency which falls within the optical frequency range. It is shown that no counterposition, negative phase velocity and orthogonal phase velocity are exhibited by the silver metal at L-nihility frequency. Phase velocity is plotted against incident angles and the corresponding effects on the Minkowski momentum density are noticed. Numerical results are compared with those of the optical refraction in silver metal, and interesting points are highlighted.

Effects on reflected and transmitted powers of planar stratified structures involving chiral nihility metamaterials

Behavior of different planar multilayer periodic structures due to plane wave excitation has been studied using the transfer matrix method. Multilayer structure is composed of odd number of slabs and the layers at odd locations have same characteristics and layers at even locations have same characteristics. For each structure, layers at odd locations are of chiral nihility metamaterial whereas three different cases are considered for layers at even locations, i.e., dielectric, chiral and chiral nihility. Effects of polarization rotation due to the optical activity of materials chirality is studied with respect angle of incidence and frequency in THz region. Chiral nihility adds property of transparency to the structure for normal incidence. Chiral nihility-chiral nihility structure for normal incidence yields transparency whereas same structure for oblique incidence yields total rejection at higher frequencies.

Analysis Of Electromagnetic Field Transmitted By A Uniaxial Chiral Lens

Abstract —In this paper, the transmission of the electromagnetic waves through a plano convex lens of lossless uniaxial chiral medium is derived using dyadic transmission coefficient. Derived geometrical optics field is valid everywhere except at focal point where it gives infinite value.Singularity of the field at focal point is addressed using Maslov’s method. The effects of different constitutive parameters on the refracted field are also discussed.