Optical modeling of waveguide photonic nanostructures using the radiation spectrum method (RSM) with evanescent modes

In this work, me study the effects of the evanescent modes in the simulatio n and modeling of optical integrated circuits based on photonic bandgap str uctures. We show that the contribution of these modes in the energy transfe r in structures like the MOEM structures, can not be neglected, The radiati on spectrum method, recently developed by the authors for the guided wave d evices, is thus extended to account for the evanescent mode propagation. Ap plying this technique on an air-gap in a suspended waveguide a model of thi s gap is developed in terms of its parameters. This model is then integrate d in an all optical simulator to predict the performance of photonic struct ures. Such technique enables to design and to optimize the photonic integra ted circuits taking the evanescent modes effects into account.