Enhanced Evanescent Confinement in Multiple-Slot Waveguides and Its Application in Biochemical Sensing
Enhanced Evanescent Confinement in Multiple-Slot Waveguides and Its Application in Biochemical Sensing
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DOI：
10.1109/jphot.2009.2025602
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发表时间：
2009-01-01
影响因子：
2.4
通讯作者：
Dalton, Larry R.
中科院分区：
文献类型：
--
作者：
Sun, Haishan;Chen, Antao;Dalton, Larry R.
在波导结构中传播的光通过其倏逝场与周围介质的相互作用已被用于检测生物化学活动而不标记目标分子。通过在介质波导中引入多个狭缝，我们发现在周围介质中可以实现更强的倏逝场，同时仍然保持良好的光学限制。使用具有三个槽的单模波导的微谐振器传感器的实验演示表明，与没有槽的波导相比，均匀感测的灵敏度增加了5倍，表面感测的灵敏度增加了3倍以上。数值模拟表明，更高的灵敏度增强（高达100倍）作为更多的槽和更大的波导宽度使用。
The interaction of light propagating in the wave-guiding structures with the surrounding media through its evanescent field has been used to detect biochemical activities without labeling the target molecules. By introducing multiple slots in a dielectric waveguide, we found that a much stronger evanescent field could be achieved in the surrounding media while still maintaining good optical confinement. The experimental demonstration of microring resonator sensors using single-mode waveguides having three slots indicates a 5-fold increase in sensitivity for homogeneous sensing and more than 3-fold increase in sensitivity for surface sensing in comparison to those of a waveguide without slots. Numerical simulations suggest an even higher sensitivity enhancement (as high as 100 times) as more slots and larger waveguide widths are used.