Surface polaritons at the interface of gyrotropic and nonlinear isotropic media

Surface polaritons at the interface of gyrotropic and non-linear isotropic media are investigated. Dispersion equation and existence conditions for TE surface polariton modes are obtained

Surface polaritons in symmetry planes of biaxial crystals

An integral approach is presented in the theory of surface electromagnetic waves propagating along the plane interface of bianisotropic non-absorbing media including optically active gyrotropic and bigyrotropic ones. This approach gives a uniform way of obtaining the dispersion equation for surface polaritons for an arbitrary cut section of the bianisotropic crystals and allows us to establish the existence conditions of surface polaritons. An example of application of this approach for the boundary of bianisotropic and isotropic media is given

Plasmonic nanoparticle monomers and dimers: From nano-antennas to chiral metamaterials

We review the basic physics behind light interaction with plasmonic nanoparticles. The theoretical foundations of light scattering on one metallic particle (a plasmonic monomer) and two interacting particles (a plasmonic dimer) are systematically investigated. Expressions for effective particle susceptibility (polarizability) are derived, and applications of these results to plasmonic nanoantennas are outlined. In the long-wavelength limit, the effective macroscopic parameters of an array of plasmonic dimers are calculated. These parameters are attributable to an effective medium corresponding to a dilute arrangement of nanoparticles, i.e., a metamaterial where plasmonic monomers or dimers have the function of "meta-atoms". It is shown that planar dimers consisting of rod-like particles generally possess elliptical dichroism and function as atoms for planar chiral metamaterials. The fabricational simplicity of the proposed rod-dimer geometry can be used in the design of more cost-effective chiral metamaterials in the optical domain.Comment: submitted to Appl. Phys.

Guided modes in negative-refractive-index fibres

We consider propagation of electromagnetic waves in a circular fibre with a core of negative-refractive-index metamaterial. We study the fast and slow guided modes of a dispersive fibre and the mode properties depending on the fibre parameters. We show the peculiar mode properties of a fibre with simultaneously negative dielectric permittivity and magnetic permeability of the core: the perfect phase matching of the TE and TM slow modes, sign-varying energy flux, and the existence of TEM modes

Total internal reflection of vector Bessel beams: Imbert–Fedorov shift and intensity transformation

Total internal reflection of vector Bessel beams is studied. Transmitted beams are described by the evanescent fields, the energy fluxes of which show the shift of the reflected beam. As is well known, the Imbert–Fedorov shift is the lateral displacement of the plane wave leading the reflected beam out from the plane of incidence. Using an analogy with plane waves, the Imbert–Fedorov shift is introduced for the Bessel beams. This shift results in the intensity redistribution of the reflected beam compared with the incident one

Vector beams as the superposition of cylindrical partial waves in bianisotropic media

The exact solutions for arbitrary electromagnetic beams in bianisotropic media are constructed. The solutions are expressed using tensor Fourier transform whose physical meaning is the superposition of partial waves. We use cylindrical partial waves (vector Bessel beams) and derive exact and paraxial solutions for cylindrically symmetric beams in isotropic, bi-isotropic and bianisotropic media. The comparison of the spatial evolution of vector Bessel– Gauss beams in different media is made

Poynting singularities in optical dynamic systems

We develop the theory of the Poynting singularities critical points of the Poynting vector extending the theory of dynamic systems to classify and analyze optical singularities. An optical dynamic system is described by the three first-order differential equations for the image point, with the tangent to the image point trajectory being the Poynting vector. Important feature of the Poynting singularities is the existence of the polarization induced singularities arise due to the specific field polarization along with the field-induced ones appear owing to the vanishing the fields. We analyze not only isolated critical points, but the manifolds of singularities forming lines and surfaces as well. We define the types of the singular points vortex, saddle, sink, source, and focus using the trace and determinant of the stability matrix. Such a criterion and the study of the dependence on parameter bifurcations are applied for a number of examples. We offer to study the chaotic dynamic of the image point in future