基于传输矩阵理论和光学谐振原理, 研究了含敏感空气缺陷层的一维光子晶体谐振腔的谐振特性, 建立起敏感气体折射率变与红外波段谐振峰波长之间的线性变化关系。设计了基于红外波段光子晶体谐振腔的线性折射率传感器, 利用MATLAB软件数值模拟, 得到线性传感器的半峰带宽小到3nm左右、Q值可达到1400、敏感度可达1070nm/RIU。在光谱仪的分辨率为0.01nm时, 传感器的分辨率可达9.35×10-6RIU。结果表明, 基于光子晶体结构的折射率传感器, 具有良好的线性特性、高的灵敏度以及高Q 值等特点, 可为气体折射率检测提供一定的理论参考。

Based on the theory of transfer matrix and the Principle of optical resonance, the resonance characteristics of one dimension photonic crystal composed of sensitive air defect cavity are studied, the linear relationship between the resonant wavelength and the sensitive air refractive index n is established. A linear refractive index sensor is designed in infrared waveband. The sensing characteristics are analyzed by MATLAB, and found that the half peak bandwidth of the linear sensor is less than 3nm, the Q value is1440 、the sensitivity is 1070.0 nm/RIU. When the resolution of the spectrometer is 0.01nm, the resolution of the sensor is up to 9.35×10-6RIU.The results show that the sensor has good linearity, high sensitivity and high Q values etc., which provides base for design and application of high precision gas refractive index sensors.