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Journal of Nanophotonics

Nonconcentric triple-microring resonator for label-free on-chip sensing with high figure-of-merit
Author(s): Zhan-Qiang Hui; Youkun Zhang; Min Yang; Shixiu Wei; Meizhi Zhang; Fengtao He
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Paper 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.

Paper Details

Date Published: 21 August 2017
PDF: 14 pages
J. Nanophoton. 11(3) 036014 doi: 10.1117/1.JNP.11.036014
Published in: Journal of Nanophotonics Volume 11, Issue 3
Show Author Affiliations
Zhan-Qiang Hui, Xi'an Univ. of Posts & Telecommunications (China)
Youkun Zhang, Xi'an Univ. of Posts & Telecommunications (China)
Min Yang, Xi'an Univ. of Posts & Telecommunications (China)
Shixiu Wei, Xi'an Univ. of Posts & Telecommunications (China)
Meizhi Zhang, Xi'an Univ. of Posts & Telecommunications (China)
Fengtao He, Xi'an Univ. of Posts & Telecommunications (China)


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