多类型缺陷结构一维硅基光子晶体生物传感器的性能分析

Performance analysis of one-dimensional silicon-based photonic crystal biosensors with different defect structures

为了对一维硅基单缺陷结构光子晶体生物传感器的传感性能进行更准确的研究分析,在保持一维光子晶体结构的晶格常数和占空比等参数不变的情况下,通过改变硅层宽度、改变空气层宽度、同时改变硅层和空气层等方法构造了不同类型的缺陷体,设计了工作波长在1 550nm附近的缺陷体结构参数。通过对不同类型缺陷体的模场空间分布和相应透射波长峰值位置随着待测液体折射率变化灵敏度的分析,获得了不同类型缺陷体对一维生物传感器灵敏度的影响规律,可为高灵敏度一维光子晶体生物传感器的实验制备和实际应用提供参考。

The sensing performance of one-dimensional silicon-based single-defect photonic crystal biosensors is studied in this paper.To maintain the parameters such as the lattice constant and the duty ratio of the one-dimensional photonic crystal structure unchanged,different types of defects are constructed by changing the width of the silicon layer and the width of the air layer.By changing the silicon layer and the air layer at the same time,the designed structure parameters of the defect with working wavelength around 1 550 nm are obtained.The influence of different defect types on the sensitivity of one-dimensional biosensor is obtained by analyzing the spatial distribution of mode fields and the corresponding peak position of transmission wavelength with the sensitivity of refractive index change of the liquid to be tested,and these results have laid a firm foundation to the experimental preparation and practical application of the high-sensitivity one-dimensional photonic crystal biosensor.