Recently, materials with negative electric permittivity and negative magnetic permeability simultaneously have attracted much attention. In such materials, the electric field, the magnetic field and the wave vector of an electromagnetic wave obey the left-handed rule. Hence they are called as the left-handed materials (LHM). Because of the negative refractive index, there are many novel phenomena in LHM. Firstly, a LHM slab can be made as a perfect lens. Secondly, negative refractive index will lead to EM wave and energy localization. Such features may find important applications in optical and microwave devices.
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