Fano resonances in a multimode waveguide coupled to a high-Q silicon nitride ring resonator

Dapeng Ding, Michiel J A De Dood, Jared F. Bauters, Martijn J R Heck, John E. Bowers, Dirk Bouwmeester

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

Abstract

Silicon nitride (Si3N4) optical ring resonators provide exceptional opportunities for low-loss integrated optics. Here we study the transmission through a multimode waveguide coupled to a Si3N4 ring resonator. By coupling single-mode fibers to both input and output ports of the waveguide we selectively excite and probe combinations of modes in the waveguide. Strong asymmetric Fano resonances are observed and the degree of asymmetry can be tuned through the positions of the input and output fibers. The Fano resonance results from the interference between modes of the waveguide and light that couples resonantly to the ring resonator. We develop a theoretical model based on the coupled mode theory to describe the experimental results. The large extension of the optical modes out of the Si3N4 core makes this system promising for sensing applications.

Original languageEnglish
JournalOptics Express
Volume22
Issue6
Pages (from-to)6778-6790
Number of pages13
ISSN1094-4087
DOIs
Publication statusPublished - 2014
Externally publishedYes

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