[求助]有人用FDTD算过声子晶体的吗

有人用FDTD算过声子晶体的吗，能不能指点一下布洛赫初始条件 .. <J}9.k
 
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It should not be very diffcult H>X1(sh#}  
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(1) set all the variable ( six field components---in 3D) as complex \1'R}B@;  
(2) Based Brllouin zone k-path, calculate the wave-vactor for ech direction---kx, ky, kz L(P:n-
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(3) by using the Bloch's theorem, make the code as F(x+a)=F(x)*exp(j*kx*a) QjN3j*@  
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请问第二步具体应该怎么做？谢谢