expand_axis.m

利用电磁场的源激发方法来计算光子晶体波导例如光子晶体光纤

function out = expand_axis(ax, ratio)
xc = mean([ax(1) ax(2)]);
yc = mean([ax(3) ax(4)]);
width = ax(2)-ax(1);
height = ax(4)-ax(3);
out(1) = xc-width/2*ratio;
out(2) = xc+width/2*ratio;
out(3) = yc-height/2*ratio;
out(4) = yc+height/2*ratio;