Localized mode transfer and optical response in three-component composites

We investigate the eigenmode transfer of local field and optical response in three-component composites with varying the difference admittance ratio η[=(ε₂-ε₀)/(ε₁-ε₀)]. It is shown that at η=0 or η=1, i.e., a binary composite, the local-field distribution at resonances transfers from one form to another in the two-bond clusters, as well as in disordered composites. Numerical calculations also indicate that at the avoiding crossing region of dielectric resonances η∈(0,2), the effective optical responses are very sensitive to η due to the competition among eigenmodes. For η<0, the absorption peaks are blue-shifted with decreasing η, while, for η>2, the absorption peaks red-shifted with increasing η. Moreover, in a three-component square network, the relation between the summation of dielectric resonances and η is numerically proved: ∑_i=1ⁿs_i=(n₂/2)η+(n₁/2) with the total impurity bonds n=n₁+n₂.