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n1=1.4689;
n2=1.4655;
lamda=0.98e-6;
w=sqrt(b^2-(n2*2*pi/lamda)^2);
u=sqrt((n1*2*pi/lamda)^2-b^2);
r1=37e-6;
r2=42e-6;
Çó½â·½³Ì£º[w*(besseli(m,w*r1))'*besselj(m,u*r1)-u*besseli(m,w*r1)*(besselj(m,u*r1))']*[w*(besselk(m,w*r2))'*bessely(m,u*r2)-u*besselk(w*r2)*(bessely(m,u*r1))']-[w*(besseli(w*r1))'*bessely(u*r1)-u*besseli(m,w*r1)*(bessely(m,u*r1))']*[w*(besselk(m,w*r2))'*besselj(m,u*r2)-u*besselk(w*r2)*(besselj(m,u*r1))']=0
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