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More Transient Responses Previous Slide   Next Slide
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Figure 6  Planar Lens  - Even Excitation
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We can extend the simulation of the planar lens by injecting an identical wave with the same phase at the right focal point (even excitation). As the fields build up in the metamaterial lens, the far-fields of the sources duplicate each other, and all energy is radiated as a cylindrical wave, one half emanating from each of the sources.

Movie
Figure 7  Planar Lens  - Odd Excitation
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Injecting an identical wave at the right focal point with a 180 degrees phase shift results in an odd excitation. As the fields build up in the metamaterial lens, the far-fields of the sources extinguish each other, and all energy is guided in the form of surface waves along the lens to infinity (or rather the absorbing boundaries at the top and bottom of the computational domain).

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Figure 8 Planar Lens - Directional Coupling
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In this example two point sources are placed on each side of the metamaterial slab, one-quarter of a wavelength apart, and excited in phase quadrature. As a result, the surface waves launched downwards cancel each other, and all power is directed upwards. This arrangement represents a directional, radiation-free interconnect between the two sources and the metamaterial slab acting as a surface waveguide.

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