Dear List,
I'm trying to simulate waves in a conducting medium impinging on a
conducting object. The meep material information suggests that the
perfect metal can be acheived by setting its epsilon to a large and
negative value (ie -1e20) which seems to work well. My weakly conducting
medium which has a conductivity of 4 Siemens and a dielectric constant
of 80 (yes - this is seawater...) is proving harder ton get.
The material section suggests that this can be done by setting the three
polarisation parameters for the dispersion so that the resonnat
frequenecy omega_n is very small in the denominator. I've set the following:
omega_n=1e-20
delta epsilon=27e35
gamma=60e4
This makes the system approximate to the model of a conductor in which
relative dielectric constant is given by:
epsilon=e_r+i*sigma /(angular freqeuency * permittivity of free space).
In order to determine if this is working well I need to construct a
field versus distance plot to check if the system is reproducing the
skin depth attenuation expected at these frequenciues (~1000Hz in my
test simulation).
So - Can anyone tell me if I'm doing the dielectric right, and how to
extract a plot of field versus distance from my source ?
all the best
Chris
--
..................................................................
. Dr.Chris Stevens . Oxford University .
. Tel: +44 1865 283272 . Department of Engineering Science .
. Fax: +44 1865 273905 . Parks ROad .
. [EMAIL PROTECTED] . Oxford, OX1 3PJ, UK .
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