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基于光子晶体的局域特性,提出一维镜像空气栅光子晶体结构。引入镜像结构在光子晶体中间形成缺陷腔,从而在透射谱禁带中得到谐振透射峰。基于传输矩阵法,建立谐振波长与光子晶体结构参数之间的关系模型。通过观测谐振透射峰值波长的漂移,利用矩形空气栅光子晶体结构即可实现待测气体样本参数的动态监测。以甲醛为待测样本,对该折射率传感器的Q值和灵敏度进行分析。结果表明,其Q值可达1739.48,其灵敏度可达816.67nm·RIU-1(RIU表示单位折射率),证明了结构设计的有效性。该结构可为空气污染监测和气体组分分析等方面提供一定的理论参考。
Based on the local characteristics of photonic crystals, a one-dimensional mirror airglass photonic crystal structure is proposed. A mirror structure is introduced to form a defect cavity in the middle of the photonic crystal so as to obtain a resonant transmission peak in the transmission band gap. Based on the transfer matrix method, the relationship between resonant wavelength and photonic crystal structure parameters was established. By observing the drift of the resonant transmission peak wavelength, the rectangular air grid photonic crystal structure can be used to realize the dynamic monitoring of the gas sample parameters to be measured. Formaldehyde as the sample to be tested, the refractive index sensor Q value and sensitivity analysis. The results show that the Q value can reach 1739.48 and its sensitivity can reach 816.67nm RIU-1 (RIU means unit refractive index), which proves the effectiveness of the structural design. The structure can provide certain theoretical reference for air pollution monitoring and gas composition analysis.