Highly-sensitive silicon-on-insulator sensor based on two cascaded micro-ring resonators with vernier effect |
| |
Authors: | Lei Jin Jian-Jun He |
| |
Institution: | Centre for Integrated Optoelectronics, State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou, PR China 310027 |
| |
Abstract: | A highly-sensitive integrated optical biosensor based on two cascaded micro-rings resonator (MRR) is investigated theoretically and experimentally. The free spectral ranges (FSRs) of two cascaded micro-rings are designed to be slightly different in order to generate Vernier effect. A preliminary investigation of our sensor with a Q factor of 2 × 104 using different ethanol concentrations shows that the Vernier effect can improve the sensitivity to 1300 nm per refractive index unit (RIU), compared to 62 nm/RIU for a single ring sensor. The sensor also has a large measurement range of refractive index change up to 1.15 × 10− 2 RIU. It can be useful for low-cost and highly-sensitive optical biosensor system. |
| |
Keywords: | Optical sensor Silicon-on-insulator Cascaded micro-rings resonator |
本文献已被 ScienceDirect 等数据库收录! |