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    MATLAB Finding photonic crystal resonance frequency with Bessel and Hankel functions

    Hi, I research on photonic crystals.I want to compute resonance frequency for single cylinder scattering. I use the below expression : J'(nkr)H(kr)-J(nkr)H'(kr)=0 J:bessel and H:hankel function. but I can't achieve correct result by write program in Matlab for computing that. Can you help me ?
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