21 August 2017 Nonconcentric triple-microring resonator for label-free on-chip sensing with high figure-of-merit
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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.
© 2017 Society of Photo-Optical Instrumentation Engineers (SPIE)
Zhan-Qiang Hui, Zhan-Qiang Hui, Youkun Zhang, Youkun Zhang, Min Yang, Min Yang, Shixiu Wei, Shixiu Wei, Meizhi Zhang, Meizhi Zhang, Fengtao He, 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 . Submission: Received: 31 March 2017; Accepted: 24 July 2017
Received: 31 March 2017; Accepted: 24 July 2017; Published: 21 August 2017
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