Chiral soft-surface waveguide mode transformer

Field propagation in a cylindrical, transversely balanced corrugated wavegu ide which is filled with chiral medium is considered. The eigenfields insid e this kind of waveguide are circularly polarized. In this study, the spher ically symmetric modes are considered. For small chirality parameter values , there exists weak coupling between the eigenfields, which results in a ch ange in polarization of the propagating field. This effect makes it possibl e to produce mode transformers and phase shifters for circular waveguides. (C) 2000 John Wiley & Sons, Inc.