Highly sensitive digital optical sensor based on cascaded high-Q ring-resonators
Highly sensitive digital optical sensor based on cascaded high-Q ring-resonators
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DOI：
10.1364/oe.17.023817
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发表时间：
2009-12-21
期刊：
影响因子：
3.8
通讯作者：
Dai, Daoxin
中科院分区：
文献类型：
--
作者：
Dai, Daoxin
提出了一种基于两个不同自由光谱范围的级联环的数字光学传感器。由于它们的fsr不同，当环1的有效折射率发生变化时，输出端口的光谱响应的主峰会发生数字位移。主峰的位移等于环2的多个fsr。由于易于设计具有纳米级FSR的环，因此该数字光学传感器具有超高的灵敏度（10(5)nm/RIU），比普通单环传感器高出两个数量级以上。利用现有的数字光学传感器，可以方便地使用集成光学微型光谱仪（即使分辨率很低）来监测光谱响应的峰移。因此，在单芯片上实现低成本、便携的高灵敏度光学传感器系统是有希望的。(C) 2009年美国光学学会
A digital optical sensor based on two cascaded rings with different free spectral ranges (FSRs) is proposed. Because of their different FSRs, the major peak of the spectral response from the output port shifts digitally when the effective refractive index of ring #1 changes. And the shift of the major peak is equal to multiple FSRs of ring #2. Since it is easy to design a ring with a FSR of nanometers, the present digital optical sensor shows an ultra-high sensitivity (at the order of 10(5) nm/RIU) which is over two orders higher than that of a regular single-ring sensor. By using the present digital optical sensor, it becomes convenient to use an integrated optical micro-spectrometer (even with a low resolution) to monitor the peak shift of the spectral response. Therefore, it is promising to realize a low-cost and portable highly-sensitive optical sensor system on a single chip. (C) 2009 Optical Society of America