A Nonlinear Microresonator Refractive Index Sensor
A Nonlinear Microresonator Refractive Index Sensor
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DOI：
10.1109/jlt.2015.2464105
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发表时间：
2015-10
影响因子：
4.7
通讯作者：
Chao Wang;C. Search
中科院分区：
文献类型：
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作者：
Chao Wang;C. Search
我们提出了一种基于非线性折射率的超灵敏折射率（RI）传感器，该传感器是在微环谐振腔中耦合到加滴结构的波导中。非线性自相位调制和交叉相位调制之间的差异所引起的非互易性导致两种反传播模式的光强分岔。分裂的大小敏感地取决于谐振器的共振频率，因此，有效折射率。这种非线性系统对RI变化的灵敏度比线性微谐振器RI传感器的理论灵敏度高两个数量级。我们讨论了微谐振器的潜在材料实现和这些材料的检测极限。
We propose an ultrasensitive refractive index (RI) sensor based on the nonlinear index of refraction in a microring resonator coupled to waveguides in an add-drop configuration. The nonreciprocity caused by the difference between the nonlinear self-phase and cross-phase modulation leads to a bifurcation of the optical intensities for two counterpropagating modes. The magnitude of the splitting depends sensitively on the resonance frequency of the resonator, and hence, the effective index of refraction. This nonlinear system is up to two orders of magnitude more sensitive to RI changes than the theoretical sensitivity of a linear microresonator RI sensor. We discuss potential material implementations of the microresonator and the detection limit for these materials.