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For a cold plasma in an electric field, there will be no contribution to the to the dielectric tensor due to the ions having low thermal velocity in comparison to the electrons. Then the dielectric tensor has components \[\kappa_{xx}=\kappa_{yy}=1-\frac{\omega_{pe}^2}{\omega^2-\omega_{ce}^2}\]  \[\kappa_{xy}=\kappa_{yx}=\frac{i\omega_{ce}\omega_{ce}^2}{\omega^2-\omega_{ce}^2}\]  \[\kappa_{\parallel}=1-\frac{\omega_{pe}^2}{\omega^2}\]  Need to define an oscillating point charge in this system. Define $\rho$ from Gaus's law as \[\rho=qe^{i\omega t}\sigma(\vect{r})\] t}\sigma(\vec{r})\]  where $\sigma$ $\sigma(\vec{r})$ is the delta function at $\vec{r}$ at zero.