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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 6 — Mar. 24, 2014
  • pp: 6778–6790

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, and Dirk Bouwmeester  »View Author Affiliations

Optics Express, Vol. 22, Issue 6, pp. 6778-6790 (2014)

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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.

© 2014 Optical Society of America

OCIS Codes
(060.2310) Fiber optics and optical communications : Fiber optics
(130.0130) Integrated optics : Integrated optics
(230.5750) Optical devices : Resonators
(230.7370) Optical devices : Waveguides

ToC Category:
Integrated Optics

Original Manuscript: December 16, 2013
Revised Manuscript: March 5, 2014
Manuscript Accepted: March 7, 2014
Published: March 17, 2014

Dapeng Ding, Michiel J. A. de Dood, Jared F. Bauters, Martijn J. R. Heck, John E. Bowers, and Dirk Bouwmeester, "Fano resonances in a multimode waveguide coupled to a high-Q silicon nitride ring resonator," Opt. Express 22, 6778-6790 (2014)

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