设计了一种可以探测单个纳米粒子的光学传感器结构, 该结构由双环、双环间耦合区的通孔和直波导构成, 并引入了Fano效应, 进一步增强了粒子在光场中出现时的光耦合场变化.当纳米粒子穿过两个微环间的通孔时, 其耦合系数和输出端的光强均发生变化, 提出了一种基于双环谐振器结构的高精度耦合系数传感方法, 通过检测双环谐振器耦合系数和输出端光强的变化对单体纳米粒子进行精确检测和计数.理论计算结果表明, 在损耗为1dB/cm的情况下, 与单环结构相比, 双环结构的灵敏度提升了两个数量级.该双环结构在减小波导损耗的同时有效提升了检测灵敏度.

Early detection of environmental disruption, unintentional or otherwise, is increasingly desired to ensure hazard minimization in many settings. Here, using a field-portable, smartphone fluorimeter to assess water quality based on the pH response of a designer probe, a map of pH of public tap water sites has been obtained. A custom designed Android application digitally processed and mapped the results utilizing the global positioning system (GPS) service of the smartphone. The map generated indicates no disruption in pH for all sites measured, and all the data are assessed to fall inside the upper limit of local government regulations, consistent with authority reported measurements. This implementation demonstrates a new security concept: network environmental forensics utilizing the potential of novel smartgrid analysis with wireless sensors for the detection of potential disruption to water quality at any point in the city. This concept is applicable across all smartgrid strategies within the next generation of the Internet of Things and can be extended on national and global scales to address a range of target analytes, both chemical and biological.