Counter
    3D FDTD calculation of the
    transmission of light through a slit
    in a thin film.

Requirements:

- jScience library (v1.1 for new JFDTD codes - 2D & 3D, v1.0 is OK for
JDFTD3D v1.0)
The Computational Physicist
Citing:

    The codes provided on this site are distributed open source under the
    GPL. If these codes are used to obtain useful results, please acknowledge
    them with reference to their name and link to where they were obtained.
    Also, if this (or associated) site(s) are useful, please provide a link to it.
    These requests are not required, but are greatly appreciated.

jFDTD2D:

      jFDTD2D is similar to FDTD++ (external link), except z-derivatives have
been set to zero (i.e., the Helmholtz equation is solved) and electric field
components are in plane.
ANNOUNCEMENT: The original 3D FDTD code,
jFDTD3D, has been rewritten and renamed FDTD++, and
is now available at FDTD++ (external link). It is now
fully-featured FDTD software.

The 2D version has not yet been incorporated into
FDTD++ (external link), and is still available below.