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为了降低外界环境温度变化对单缺陷光子晶体折射率传感的干扰,提出了一种双缺陷空气栅光子晶体的传感模型。通过紧束缚法分析光子晶体双缺陷模的产生机理,并结合传输矩阵理论分析该光子晶体结构的光学传输特性。针对折射率和温度的交叉敏感问题,提出了一种消除温度干扰的方法,并建立两缺陷模波长与光子晶体结构参数之间的关系模型。利用该空气栅光子晶体,通过观测双缺陷峰波长的漂移,即可实现待测气体样本参数的动态监测。通过数值模拟可以发现,两缺陷模的波长均与待测气体的折射率呈线性关系,该传感具有结构简单和精度高等优点。
In order to reduce the disturbance of refractive index sensing of single-defect photonic crystals, a sensing model of double-defect air-gate photonic crystals is proposed. The tight coupling method was used to analyze the mechanism of double defect modes in photonic crystals. The transmission characteristics of the photonic crystal structure were analyzed by transmission matrix theory. Aiming at the problem of cross-sensitivity of refractive index and temperature, a method of eliminating temperature interference is proposed and a model of the relationship between the wavelength of two defect modes and the photonic crystal structure parameters is established. By using the air-grid photonic crystal, the dynamic monitoring of the gas sample parameter can be realized by observing the drift of the peak wavelength of the double defect. Through numerical simulation, it can be found that both the wavelength of the two defect modes have a linear relationship with the refractive index of the gas to be measured, and the sensing has the advantages of simple structure and high precision.