The Lower- and Higher-Order Perturbation Effects of a Biisotropic Chiral Sphere in Cylindrical and Spherical Cavities - Abstract

Abstract

The lower- and higher-order perturbation effects of a biisotropic chiral sphere in cylindrical and spherical resonant cavities located at arbitrary place are investigated, and the boundary-value approach is employed to facilitate the analysis. The formulas for determining of lower- and higher-order perturbed resonant frequency shifts are obtained at first, and both TE and TM modes in the resonant cavities are treated, respectively. Some numerical results are presented to demonstrate the effects of chirality and nonreciprocity parameters of biisotropic materials on the resonant frequency shifts for different TE and TM modes. Compared with the traditional perturbation formulas under the condition of Rayleigh approximation for non-chiral case, our result can increase the accuracy of determining the constitutive parameters of biisotropic samples, in particular for "large size" case or at higher frequencies.