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Negative Refraction Previous Slide   Next Slide

A cylindrical wave emitted by a point source in air is focused in the adjacent metamaterial half-space (n=-2) due to the negative angle of refraction predicted by Veselago [1] in 1968, and experimentally verified by Eleftheriades et al. [2].
The refraction angle is negative since the tangential component of the phase velocity must be continuous at the interface, as shown in Figure 2. Both media have the same intrinsic impedance.

Movie "Negative Refraction"
Figure 2: Focusing in a metamaterial due to negative refraction.

Click the picture to see the transient electrodynamic solution showing negative refraction and focusing that occur at the interface of air and metamaterial with refractive index -2.

For comparison, click here to see regular refraction at an air/material interface with a refractive index  +2.

The actual electrodynamic solution of this refraction problem visualized here is much more complex than the simple ray diagram above suggests, since the source is only about a wavelength from the air-metamaterial interface. The intriguing MEFiSTo simulation clearly confirms the focusing effect and illustrates the negative phase velocity in the metamaterial.

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