Abstract

The resonant optical phenomena associated with the physics of Fano resonances have received particular attention due to their numerous potential applications. In this work, the Fano resonance behaviors of a planar waveguide with two dielectric ridges have been theoretically studied. By using the temporal coupled-mode theory, a general formula was obtained for describing the Fano response of a structure, and general conclusions for the determination of the resonance parameters were drawn. A special type of Fano resonance (i.e., Fano antiresonance) was demonstrated by tuning the resonance parameters. Different from the results by using two effective coupling oscillators, two kinds of Fano antiresonance phenomena were found. We showed that the Fano antiresonance effects of a structure can suppress the transmission of the guided mode and contribute to different field localization behaviors in the ridges due to the different interference effects. By obviating the need for a near-field interaction, the Fano antiresonance effects induced by phase coupling pave the way toward dynamic control of the spectral response and field localization behaviors in the integrated optoelectronic system.

© 2019 Optical Society of America

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