Abstract

Intensive research in photonics has discovered many original and fascinating optical phenomena associated with the physics of Fano resonances. Here we extend the research of Fano resonance to on-chip multiple modes and high-order mode, which can be called multimode Fano resonance. By exploiting both wavelength and mode degrees of freedom, we demonstrate a compact structure to engineer wavelength- and shape-controlled multimode Fano resonances on an integrated photonic platform. Both simulated and experimental results indicate that the unambiguous asymmetric spectra line shapes for both transverse electric modes (${{\rm TE}_0}$ and ${{\rm TE}_1}$) can be further applied to low-power mode switching. The demonstrated on-chip multimode Fano resonances scheme may provide a new perspective for exploring the advantages and applications of multimode Fano resonances in integrated photonics.

© 2020 Optical Society of America

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