Dear User, I have a question. By definition the imaginary part of the dielectric function is positive and also it can be seen from its mathematical expression that at zero frequency it should be zero. Right now I am studying some structure where sometimes I am getting 0 at 0 frequency and sometimes I am not getting 0 at 0 frequency. It is coming of the order of 10. Do any of you know what is the reason behind it.
-- *Senior research fellow Dept. of Physics, University of Calcutta Kolkata- 700009, West Bengal, India.* * Ph no-+91-9830512232*
