Channel drop tunneling through localized states

We present a general analysis of the tunneling process through localized resonant states between one-dimensional continuums. We show that complete transfer fan occur between the continuums by creating resonant states of different symmetry, and by forcing an accidental degeneracy between them. The degeneracy must exist in both the real and imaginary parts of the frequency. We illustrate the results of the analysis by performing computational simulations on the transport properties of electromagnetic waves in a two-dimensional photonic crystal. [S0031-9007(97)05091-6].