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

作者：Hui, Zhanqiang^*; Zhang, Youkun; Yang, Min; Wei, Shixiu; Zhang, Meizhi; He, Fengtao

来源：Journal of Nanophotonics, 2017, 11(3): 036014.

DOI：10.1117/1.JNP.11.036014

• integrated photonics
• waveguide
• optical sensor
• microring resonator

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 x 10(9) 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.

• 出版日期2017-7
• 单位西安邮电大学