Abstract
In this work, we show how to manipulate the electromag- netic wave at will by using an indeflnite medium with extremely strong anisotropy. The negative element in the indeflnite permittivity tensor goes to the negative inflnity while the positive element is equal to 1, which stretches the hyperbolic equifrequency contour into a straight line type. The direction of the Poynting vector and the wave vector is aligned by the straight line type equifrequency contour along the orientation of the extremely negative permittivity, thus control the wave propagation. The other permittivity of 1 makes the indeflnite medium matched with the air. Moreover, because of the hyperbolic equifrequency contour, evanescent wave can also transmit in the indef- inite medium under the propagation mode, implying the possibility of controlling an evanescent wave by this special indeflnite medium. Sim- ulations are performed to demonstrate the controlling performance and a potential design to realize such a medium by metamaterial with mul- tilayered metal/dielectric structure. This work may supply a shortcut for those former devices based on the Transformation optics.
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