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Developer

The source code of MESH is in src/ folder, which consists of the following files and folders:

arma/: the folder contains all the headers from armadillo.
luawrapper/: the Lua wrapper for C++ classes and MPI.
mathlib/: some mathematical functions such as Bessel functions, and Gauss-legendre integral method.
utility/: templates for smart points as well as exception handling.
Cubature.c: a fast adaptive integration method for high dimensional functions, adoptted from the original code.
Fmm.cpp: file computing the Fourier transform for different geometries.
Gsel.cpp: file containing functions to select G vectors.
Rcwa.cpp: file computing the RCWA and Poynting vector.
System.cpp: file containing material, layer and structure classes and their methods.
Mesh.cpp: file containing different types of simulations and C++ API.
main_lua.cpp: file implementing Lua API.
main_python.cpp: file implementing Python API.

The class structure is illustrated in the following figure

code structure

There are few features that need to be implemented in MESH:

A correct and fast implementation of Fourier transform over dielectric functions.
Improved ways of doing $k_x$ and $k_y$ integral other than the current naive summation method.
Computing more physical quantities, such as energy density and Casimir force.