A thin dielectric slab over a conducting sheet is presented as a low-loss slow-wave guiding system. When one introduces a magnetic wiggler into the system one may efficiently excite millimeter waves by passing a sheet ...

A model for a step-index fiber in the form of an equivalent slab guiding structure is presented. This model simplifies the analysis of fiber directional couplers and coupler half-blocks with dielectric and metallic ...

The introduction of a plasma and a strong guide magnetic field in a free electron laser (FEL) slows down the phase velocity of radiation, significantly reducing the requirements on beam energy for generating frequencies ...

The dispersion characteristics of a helix-loaded traveling-wave tube (TWT) when a dielectric or plasma is introduced into the system are discussed. The dispersive properties of the dielectric-supported helix waveguide are ...

Coupling characteristics of directional couplers consisting of two dual-mode highly elliptical-core fibers have been studied in detail using a first-order perturbation approach, and two different designs of a mode filter ...

A matrix method that is applicable to an arbitrary potential variation represented by a set of linear functions such as multiple quantum well structures in the presence of a static electric field is described. An analytical ...

A partially dielectric-loaded waveguide supports modes with phase velocity νph>c/∈1/2, where ∈ is the dielectric constant of the lining. The coupling of a fast mode (with νph>c) with a slow mode (with c /∈1/2<νph<c) via a ...

A method for the determination of equivalent step index (ESI) parameters for a given single-mode fiber is presented. The method is based on the matching of bend loss characteristics and (Petermann II) spot size at one ...

The effect of profile imperfections, like axial index dip and layered structure in the inner cladding, on the leakage loss of LP01 mode in MCVD made single-mode depressed index cladding (DIC) fibres is investigated ...

Investigations of the possible processes of charge transport common to ferroelectric ceramics and high-Tc superconductors are reported. Some potential experimental techniques for studying ferroelectrics and superconductors ...