光子晶体的相位特性在高灵敏温度传感器中的应用

对含耦合缺陷的不对称结构光子晶体的研究发现，其缺陷模频率附近的反射率接近于1，而缺陷模频率附近反射光的相移随频率迅速改变；当缺陷层为折射率的温度敏感材料时，温度的极微小变化就能使处于缺陷模频率的反射光相移发生很显著变化.根据这一原理，设计了高灵敏高分辨率的相位温度传感器.以高灵敏高分辨率的温度传感器为例，介绍高灵敏高分辨率的相位传感器的工作原理.关键词：光子晶体相位传感器

Sensitive temperature sensor based on phase properties of photonic crystal

It is revealed in the present paper that the reflectance around the defect mode of one-dimensional defective photonic crystal (PC) in an asymmetric structure approaches to 1, while the phase-shift depends on the number of the coupled-defect layers, i.e., the phase shift is 2π for every sub-peak of the defect mode. When the defect layer is a temperature sensitive material, very small change of temperature will cause a significant phase change. Secondly, it is demonstrated that the relationship of phase and temperature has a linear range. According to the above characteristics, a highly sensitive temperature sensor is designed based on the phase property of photonic crystal. Moreover, this principle of PC phase sensing can be extended to study other sensors, such as the two-dimensional PC, which is suitable for optical integration.