纳流通道-谐振腔耦合结构测量荧光物质微位移

本文提出了一种纳流通道-谐振腔耦合结构,用于实现对荧光物质微位移的检测。在本文中,首先,使用时域有限差分法,研究了量子点偏振态及结构参数对荧光与结构耦合效果的影响,进而对结构进行优化;然后,通过测量耦合结构输出光功率的变化,实现对荧光物质微位移的检测;最后,对影响传感灵敏度的因素进行研究。结果表明,相比传统方法,纳流通道-谐振腔耦合结构的折射率处于2.8~3.3之内时,该结构都可以实现对荧光物质微位移的高精度准确传感,并且通过减小纳流通道与谐振腔的间距可进一步提高传感灵敏度。

Nanofluidic channel-resonant cavity structure for measuring micro-displacement of fluorescent substances

In order to measure the micro-displacement of a fluorescent substance,we propose a nanofluidic channel-resonant cavity structure.Firstly,by using the Finite-Difference Time-Domain(FDTD)method,the influences of the quantum dot’s polarization state and structural parameters on the coupling effect of fluorescence and structure are studied and the structure is optimized.Then,the micro-displacement of the fluorescent substance is detected by measuring the change in the optical power output of the coupled structure.Finally,the factors affecting the sensitivity of the sensors are studied.The results show that,compared with the traditional method,when the refractive index of the nanofluidic channel-resonant cavity coupling structure is in the 2.8~3.3 range,the structure can sense of the micro-displacement of a fluorescent substance with high accuracy.The results also show that the sensing sensitivity can be further improved by reducing the distance between the nanofluidic channel and the resonant cavity.