中文摘要：

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.

英文摘要：

An optical sensing structure was designed to detect the single Nanoparticle.The structure consists of a dual-ring,a nanopore in the coupling area and a straight waveguide,and the Fano effect is introduced.The proposed structure could further amplify the change of coupling effect due to the presence of nanoparticle.Nanoparticles flowing through a nanopore between microrings could change both the coupling coefficient and the optical intensity at the output.An ultrahigh precision method for coupling coefficient sensing was proposed based on a dual-microring resonator structure.The counting and sizing of nanoparticle could be achieved by detecting the change of optical intensity and coupling coefficient.The theoretical results show that the sensitivity of the dual-ring design is calculated to be around two orders of magnitude greater than a single-ring design under 1dB/cm loss condition.The propose structure can improve the sensitivity effectively with reducing the waveguide loss.