Abstract
Re∞ectionless cylindrical concentrators have been designed up to now in an initially empty core space by applying form- invariant, spatial coordinate transformations of Maxwell's equations. We show that the re∞ectionless cylindrical concentrators in initially homogeneous and isotropic dielectric core media allow an enhanced concentration of the incident fleld. Designs of more complex re∞ectionless concentrators in initially inhomogeneous dielectric media represented by empty or dielectric-fllled circular containers are also presented. The transformation equations are given explicitly, and the flelds are expressed analytically. The functionality of these devices is illustrated by several examples.
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