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High-Sensitivity Refractive Index Sensing Based on Fano Resonances in a Photonic Crystal Cavity-Coupled Microring Resonator
oleh: Fangcao Peng, Zhuoran Wang, Guohui Yuan, Lei Guan, Zhenming Peng
Format: | Article |
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Diterbitkan: | IEEE 2018-01-01 |
Deskripsi
Aiming for high-sensitivity refractive index biosensing, we investigate Fano resonance in a one-dimensional photonic crystal cavity-coupled microring resonator (PCMRR) on a silicon chip. Calculated results show that utilizing the asymmetric line shape of the Fano resonance, the detection limit can be reduced by a factor of 5 and the intensity detection sensitivity of PCMRR can be increased by a factor of 5 compared with a regular silicon-on-insulator, reaching the values of ~7.2 × 10<sup>-4</sup> RIU and ~1.76 × 10<sup>4</sup> dB/RIU, respectively. Owing to its simplicity, compact footprint, and excellent performances, our device would be a promising candidate for optical label-free sensing applications.