Centre for Integrated Optoelectronics, State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou, China 310027.
Opt Lett. 2011 Apr 1;36(7):1128-30. doi: 10.1364/OL.36.001128.
A highly sensitive optical waveguide sensor based on simple intensity interrogation with a broadband light source is proposed and investigated. It consists of two cascaded microring resonators with the same or slightly different free spectral ranges. The variation of the refractive index of the analyte sample results in a large shift in the envelope function of the transmission peaks of the sensor, and, consequently, a large change in the transmitted power. The low-cost sensing scheme can achieve an ultrahigh sensitivity of 2 × 10⁴ dB/RIU. Experimental results on the intensity interrogated double-ring sensor using a broadband source are presented, demonstrating its operation principle and potential for low-cost practical applications.
提出并研究了一种基于宽带光源简单强度检测的高灵敏度光波导传感器。它由两个级联的微环谐振器组成，具有相同或略有不同的自由光谱范围。分析物样品折射率的变化导致传感器传输峰的包络函数发生大的位移，从而导致传输功率发生大的变化。这种低成本的传感方案可以实现超高的灵敏度，达到 2×10⁴ dB/RIU。使用宽带光源对强度检测的双环传感器进行了实验，验证了其工作原理及其在低成本实际应用中的潜力。
