Re: Negative index
From: Hanyou Chu (hchu_at_thermawave.com)
Date: 07/30/04
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Date: 30 Jul 2004 13:50:32 -0700
"Salvo" <xx_salvo_xx@hotmail.com> wrote in message news:<faUNc.68006$5D1.3192665@news4.tin.it>...
> Some metals have a negative real refractive index (e.g. silver near UV) or
> so-called "metamaterials" can create the same effect.
> Suppose that a monocr. wave propagates in such materials: shouldn't the
> phase velocity be < 0? Or does something else happen?
> Thanks.
Refractive index can never be negative. It is the dielectric function
that can become negative. The correct statement is that the dielectric
function should only be in the upper(or lower depending on your definition)
complex plane. The refractive index is the square root of the dielectric
function, and therefore should lie in the first quadrant(only single
branch).
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