CHANNEL DROP FILTERS IN PHOTONIC CRYSTALS

We present a general analysis of channel drop filter structures compos ed of two waveguides and an optical resonator system. We show that 100 % transfer between the two waveguides can occur by creating resonant s tates of different symmetry, and by forcing an accidental degeneracy b etween them. The degeneracy must exist in both the real and imaginary parts of the frequency. Based on the analysis we present novel photoni c crystal channel drop filters. Numerical simulations demonstrate that these filters exhibit ideal transfer characteristics. (C) 1998 Optica l Society of America.