Nonconcentric triple-microring resonator for label-free on-chip sensing with high figure-of-merit

Zhan-Qiang Hui; Youkun Zhang; Min Yang; Shixiu Wei; Meizhi Zhang; Fengtao He

doi:10.1117/1.JNP.11.036014

21 August 2017 Nonconcentric triple-microring resonator for label-free on-chip sensing with high figure-of-merit

Zhan-Qiang Hui, Youkun Zhang, Min Yang, Shixiu Wei, Meizhi Zhang, Fengtao He

Author Affiliations +

Funded by: National High Technology Research and Development Program of China, Shaanxi Provincial Education Department Scientific Research Program, Xi’an Municipal Science and Technology Bureau Scientific Research Program, New Star Team of Xi’an University of Posts and Telecommunications

Journal of Nanophotonics, Vol. 11, Issue 3, 036014 (August 2017). https://doi.org/10.1117/1.JNP.11.036014

Abstract

A nonconcentric triple-microring resonator employing a silicon-on-insulator platform is proposed and analyzed for label-free sensing applications. The numerical simulations are carried out based on the finite-difference time-domain with perfectly matched layer boundary condition and transmission matrix methods. Its physical aspects and specific applications are highlighted. The results show that, in the optimized structure, a Q factor of 3.06×109 is achieved under weak coupling conditions. It is 3 orders of magnitude larger than that of a dual-ring resonator and 6 orders of magnitude larger than that of a single-ring resonator with lossless waveguide. In addition, to validate the proposed scheme, the designed ring resonator-based photonic sensor achieves refractive index sensing with resonance wavelength sensitivity of 101 nm/refractive index unit (RIU) and figure-of-merit of 11,211 RIU−1. Correspondingly, the detection limit of refractive index variation will be improved significantly compared with those of nonconcentric single-/dual-ring resonator and concentric triple-ring resonator. It is very useful for label-free on-chip biochemical sensing.

Citation Download Citation

Zhan-Qiang Hui, Youkun Zhang, Min Yang, Shixiu Wei, Meizhi Zhang, and Fengtao He "Nonconcentric triple-microring resonator for label-free on-chip sensing with high figure-of-merit," Journal of Nanophotonics 11(3), 036014 (21 August 2017). https://doi.org/10.1117/1.JNP.11.036014

Received: 31 March 2017; Accepted: 24 July 2017; Published: 21 August 2017

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