Dispersion engineering and frequency comb generation in thin silicon nitride concentric microresonators

Sangsik Kim, Kyunghun Han, Cong Wang, Jose A. Jaramillo-Villegas, Xiaoxiao Xue, Chengying Bao, Yi Xuan, Daniel E. Leaird, Andrew M. Weiner and Minghao Qi ()
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Sangsik Kim: Purdue University
Kyunghun Han: Purdue University
Cong Wang: Purdue University
Jose A. Jaramillo-Villegas: Purdue University
Xiaoxiao Xue: Purdue University
Chengying Bao: Purdue University
Yi Xuan: Purdue University
Daniel E. Leaird: Purdue University
Andrew M. Weiner: Purdue University
Minghao Qi: Purdue University

Nature Communications, 2017, vol. 8, issue 1, 1-8

Abstract: Abstract Kerr nonlinearity-based frequency combs and solitons have been generated from on-chip microresonators. The initiation of the combs requires global or local anomalous dispersion which leads to many limitations, such as material choice, film thickness, and spectral ranges where combs can be generated, as well as fabrication challenges. Using a concentric racetrack-shaped resonator, we show that such constraints can be lifted and resonator dispersion can be engineered to be anomalous over moderately broad bandwidth. We demonstrate anomalous dispersion in a 300 nm thick silicon nitride film, suitable for semiconductor manufacturing but previously thought to result in waveguides with high normal dispersion. Together with a mode-selective, tapered coupling scheme, we generate coherent mode-locked frequency combs. Our method can realize anomalous dispersion for resonators at almost any wavelength and simultaneously achieve material and process compatibility with semiconductor manufacturing.

Date: 2017
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DOI: 10.1038/s41467-017-00491-x

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