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We propose a method for realization of multiple Fano resonances and double electromagnetically induced transparency. The proposed device is based on only three cascaded identical 3 × 3 multimode interference microresonators on a single silicon on insulator chip. We derive the analytical expressions for the normalized transmission characteristics. The structure offers a high-modulation depth of nearly 100%, an extremely large fabrication tolerance of ±100 nm, and a compact size of 700 × 1000 μm². [ABSTRACT FROM AUTHOR]

In this paper, an improved effective index method (EIM) for designing planar multimode waveguides on the silicon-on-insulator (SOI) platform is presented. The proposed method predicts the evolution of the fields more accurately than the conventional effective index method. This improved method is particularly suited to the design of multimode interference (MMI) couplers. [ABSTRACT FROM AUTHOR]