Hi,(adsbygoogle = window.adsbygoogle || []).push({});

In deriving a complex wave vector for waves in media, an equationD= εEis typically used. Later though, it is common to relateDandEthrough a complex ε which is generally written as εcomplex = ε + 4 pi i σ / ω.

It seems a contradiction to insert one relationship into the Maxwell equations and then explain how really it's another, where a complex epsilon allows for a phase shift betweenDandE.

I'm also confused whether the σ here is necessarily complex; in the constituitive relation used to derive it, we hadj= σEand from the Dressel Electrodynamics of Solids book and the Wooten online optical solid state book he identifies σ as real.

See, for example, http://web.mit.edu/course/6/6.732/www/6.732-pt2.pdf pages 2-3.

Thanks!

**Physics Forums - The Fusion of Science and Community**

# Which dielectric constant in media?

Have something to add?

- Similar discussions for: Which dielectric constant in media?

Loading...

**Physics Forums - The Fusion of Science and Community**