介绍了一种新型一维光子晶体非完整表面缺陷模式折射率传感器的原理及方法,并构建了高分辨率、高Q值传感器探测实验系统,利用二甲基砜溶液验证了这种传感器.实验结果表明,该折射率传感器的灵敏度为3 025 nm·RIU-1(Refractive index LJnit),当光谱仪的分辨率为0.01 mn时,传感器的分辨率为3.3×10-6RIU.该传感器的Q值为260,并且在1.4～1.42范围内具有良好的线性度(线性度为0.991 27).文章分析了传感器Q值与光子晶体周期数及被探测液体厚度之间的关系.理论和实验证明这种全反射型光子晶体表面波传感器具有与SPR相似的无标、实时生物检测的特点且可获得更高的探测灵敏度、Q值和分辨率.%A novel refractive index sensor based on one-dimensional photonic crystal non-complete surface defect is introduced and the principle and the method of the sensor are discussed. The experiment system used to detect the refractive index was constructed to get high resolution and high Q-value The sensor is verified by detecting the dimethyl sulphone solution. The experimental result indicates that this refractive index sensor’s sensitivity is 3 025 nm·RIU-1, and when the resolution of spectrometer is 0.01 nm the resolution of this sensor is 3.3× 10-6 RIU. The Q value of this sensor is 260, and the sensor has good linearity in 1.4～1.42 range (the linearity is 0.991 27). It was analyzed how the photonic crystal periodicity and liquid thickness affect the Q value of the sensor. The result proved that this kind of total reflection photonic crystal surface wave sensor is label free,which is similar with SPR sensor, and the sensor has high resolution, high Q-value and has real-time survey characteristic.
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