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采用4×4传输矩阵法研究了一维镜像结构光子晶体的应力效应,重点研究了应力导致的各项异性对缺陷模的影响。模拟结果显示,应力作用导致的晶体厚度的改变,将会导致透射谱中缺陷模的明显移动,缺陷模的移动和晶体厚度呈现线性关系。进一步研究证实,对于不同材料,应力作用导致的介质的各向异性将加强或削弱这一效应。在如今对传感器精度要求越来越高的情况下,光子晶体的这些特性在压力传感器的设计制作中显示出潜在的应用价值。
The 4 × 4 transfer matrix method was used to study the stress effect of photonic crystals with one-dimensional mirror structure. The stress-induced anisotropy was analyzed emphatically. The simulation results show that the change of the crystal thickness caused by the stress will lead to the obvious movement of the defect modes in the transmission spectrum, and the linear relationship between the movement of the defect modes and the crystal thickness. Further studies confirm that the anisotropy of the medium due to stress will strengthen or weaken this effect for different materials. In today’s increasingly demanding sensor accuracy, these characteristics of photonic crystals have shown potential value in the design of pressure sensors.