Electromagnetic wave propagating through different thickness lossy left-handed material slab

FDTD method of lossy left-handed material is used to simulate the focus of a parallel-sided slab illuminated by a monochromatic source on the far side. Different slab thickness structures are simulated separately. Comparison shows that the thinner LHM slab would make its image focus point closer to the slab side. However, a very narrow slab could make the image focus disappear.