应用于生物传感的光子晶体微腔设计

We have designed an air-bridged PhC microcavity with high sensitivity and a high quality factor.The structure parameters of the microcavity are optimized by three-dimensional finite-difference time-domain method. We compare the performance of a silicon-on-insulator PhC microcavity and an air-bridged PhC microcavity,and analyze the effect of the thickness of the slab and the radius of the defect hole on the performance of the air-bridged PhC microcavity.For a thinner slab and a larger defect hole,the sens...     

A novel structure of silicon-on-insulator microring biosensor based on Young's two-slit interference and its simulation

A novel silicon-on-insulator microring biosensor based on Young’s twoslit interference has been demonstrated. The transducer signal from electric field intensity distribution on the interference screen is given by using the transfer matrix method(TMM) and two-slit interference principle.The result shows that the structure we propose is advantageous for sensing as the interference pattern is very sensitive to the ambient refractive index around the microring.A small perturbation in refractive index around the microring△n_c will result in a notable shift of destructive interference points(DIPs) on the interference screen.By detecting the shift of the DIPs,the ambient refractive index change can be obtained.     

基于杨氏双缝干涉原理的SOI微环生物传感器结构与模拟

提出了一种基于杨氏双缝干涉原理的SOI基微环生物传感器。利用散射矩阵方法和双缝干涉原理得到了干涉屏上的干涉场强分布,研究结果显示,我们提出的这种传感结构非常有利于生物传感的应用,因为干涉图形相对于微环周围折射率的变化非常敏感。微环周围折射率的微小扰动就会引起干涉屏上干涉相消点的显著移动。我们通过探测干涉屏上干涉相消点的移动达到检测上限制层折射率变化的目的。     

Design of a photonic crystal microcavity for biosensing

We have designed an air-bridged PhC microcavity with high sensitivity and a high quality factor.The structure parameters of the microcavity are optimized by three-dimensional finite-difference time-domain method. We compare the performance of a silicon-on-insulator PhC microcavity and an air-bridged PhC microcavity,and analyze the effect of the thickness of the slab and the radius of the defect hole on the performance of the air-bridged PhC microcavity.For a thinner slab and a larger defect hole,the sensitivity is higher while the quality factor is lower.For the air-bridged photonic crystal slab,the sensitivity can reach 320-nm/RIU(refractive index unit) while the quality factor keeps a relatively high value of 120 by selecting the proper slab thickness and the defect hole radius,respectively,when the refractive index is 1.33.This is meaningful for low-detection-limit biosensing.