title: Fano resonances in a multimode waveguide coupled to a high-Q silicon nitride ring resonator.
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.
authors.forename: Dapeng
authors.initials: D
authors.lastname: Ding
authors.forename: Michiel J A
authors.initials: MJ
authors.lastname: de Dood
authors.forename: Jared F
authors.initials: JF
authors.lastname: Bauters
authors.forename: Martijn J R
authors.initials: MJ
authors.lastname: Heck
authors.forename: John E
authors.initials: JE
authors.lastname: Bowers
authors.forename: Dirk
authors.initials: D
authors.lastname: Bouwmeester