Computing the bandgap of a 2D photonic crystal by COMSOL MATLAB scripting

This script uses COMSOL MATLAB scripting to compute and plot the bandgap of a 2D photonic crystal.

This script reproduces Figure 6.8 of the textbook
@book{
title={Periodic materials and interference lithography: for photonics, phononics and mechanics},
author={Maldovan, Martin and Thomas, Edwin L},
year={2009},
publisher={John Wiley \& Sons}
}
by MATLAB scripting for COMSOL Multiphysics.

See http://github.com/xiumingzhang/photonic-bandgap-comsol-matlab for demo.