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Fourier approach to the electric field and the nonlinear susceptibility for a periodic composite
PHYSICAL REVIEW B VOLUME 58 NUMBER 21 1 DECEMBER 1998-1，-0001，（）：
By using series expressions of space-dependent electrical field in a periodic composite. Which are obtained by a simple Fourer approach. The frequency dependeoce of the effective third-order nonlinear susceptibility xe of the metal-insulator composites with simple cubic arrays of coated spheres has beea exactly calculated. The results show that the frequency-dependent nonlidear response of the composites has two sharp peaks when the metal phase forms a shell structure. The strengths of the peaks are very sensitive to the relaxation time of the metal. The dependences of both the shapes and strengths of the peaks on the rakii of the cores of the coated spheres are also studied.
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