As EM waves propagate into the material where permittivity is negative, why is there a strong reflection coming from ?
Use the formula relating refractive index with permittivity in snell's law. It will come out naturally!
Vikash is right. If only the permittivity is negative, the refractive index is imaginary, so is not the same as for air, and there will be a strong reflection given by Snell's law. To get a match to a real refractive index material you need double negative material where the permeability is negative too, and where the ratio is the same, giving the same real refractive index.
Dear Mr. Yu,
the materials with negative permeability or permittivity are materials with negative material constants, the metamaterials.
We can design this materials with cupper structures at pcb. We use electromagnetic software tools with the field theory results. After the production of this materials we have geometric structures of cupper structures at pcb. And this are "onyl" material cupper structures with eps and mue negative in the electromagnetic fields with a high electric conductivity. So we have a great reflection.
All the best
F. Gräbner
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