Compact silicon-on-insulator asymmetric embedded dual microring resonators for sensing

Chaoying Zhao; Lei Zhang; Jiaxiao Liao

doi:10.1117/1.OE.57.5.056106

15 May 2018 Compact silicon-on-insulator asymmetric embedded dual microring resonators for sensing

Chaoying Zhao, Lei Zhang, Jiaxiao Liao

Author Affiliations +

Optical Engineering, Vol. 57, Issue 5, 056106 (May 2018). https://doi.org/10.1117/1.OE.57.5.056106

Abstract

A silicon microresonator consisting of an asymmetric embedded dual microring (EDMR) with a U-bend feedback coupled waveguide (FCW) is proposed and investigated for possible applications in sensing. A Fano resonance originates from the optical interference between the EDMR and racetrack-like resonator (RTR) in the proposed device. The interference between a high-Q EDMR cavity and a low-Q RTR cavity can increase the extinction ratio (ER) of Fano spectrum. The slope of Fano resonance can be well tuned by changing loss factor β of FCW. We can see the periodic spectrum transits from Lorentz profile to Fano profile by changing optical path length L of FCW. The maximum ER of Fano resonance is as high as −45 dB. Our sensor exhibits sensitivity of 1.2 × 10⁴ dB / nm, and a minimum detection limit of 2 × 10^− 7 RIU. Moreover, for such a structure, the fabrication is simple and CMOS compatible. The sensor’s performance is simulated for ethylene glycol (C₂H₆O₂) solution. The microcavity with optimized geometric structures presented provides the potential for ultracompact sensing applications.

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Chaoying Zhao, Lei Zhang, and Jiaxiao Liao "Compact silicon-on-insulator asymmetric embedded dual microring resonators for sensing," Optical Engineering 57(5), 056106 (15 May 2018). https://doi.org/10.1117/1.OE.57.5.056106

Received: 20 October 2017; Accepted: 1 May 2018; Published: 15 May 2018

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