Hello Krishna Nivedita,
As somebody who has spent a lot of time rewriting MEEP for in-house
developments, I assure you that MEEP is indeed FDTD.
Did you use a 3D cell? Did you set up PML layers? Could you show your
configuration?

Best wishes,
Alex Friman

On Tue, Sep 8, 2020, 08:29 Krishna Nivedita G <
niveditakrishn...@iisertvm.ac.in> wrote:

> Hi,
>
> I had installed the meep FDTD package a few months before, for an
> internship project, I am currently working on. First of all, I should
> confess that I am very new to FDTD simulations.
> I wanted to make a simulation of a dipole source  kept in ice which has a
> varying refractive index.
>
> As a first step,  I simply kept the source (continuous wave_ freq=1 )  in
> middle of my cell in vacuum and tried plotting intensity as a function of
> distance from the source. When I fitted it with 1/r^2  it was not fitting
> (where r is the x distance from the source).
>
> when freq= 3 or less : the fit with 1/r^2 was not good...
> when freq=4 or 5: it was  fitting  with 1/r^2 almost...
> when freq=more than 7: it was much steeper than the fit..
>
>
> I averaged total power outputted over each time step hdf5 files- till some
> 300 runs- to get intensity values? I am I finding intensity in a wrong way?
>
> Should'nt the intensity be decreasing as 1/r^2 for any frequency? What am
> I doing wrong here ? Please help.
>
> Thanks,
> --
> Krishna Nivedita G,
> Int.BS-MS,
> School of Physics,
> IISER Thiruvananthapuram.
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