光子晶体传感器在溶液检测方面具有巨大的应用潜力,设计一种光子晶体液体折射率传感器,通过在光子晶体中构造法布里珀罗腔(F-P腔)并利用光子晶体的自准直效应来实现折射率的探测。通过二维时域有限差分法(2D-FDTD)对电磁波在光子晶体F-P腔中的传播的仿真实验,最终获得了高线性度的输出光功率与液体折射率的对应关系,并可基于此特性实现液体折射率的检测。相较于其他的检测方法,光子晶体的应用使其具有体积小、测量范围广、易于与激光器件集成并且不受外界电磁环境影响等优点。

Photonic crystal sensor has great potential in solution detection.A refractive index sensor based on photonic crystal is presented.It was made by constructing a Fabry-Perot cavity(F-P cavity)in the photonic crystal where self-collimation effect was also applied.Through the simulation experiment of electromagnetic wave propagation in photonic crystal by two-dimensional finite difference time domain method (2D-FDTD),the high linearity corresponding relationship between the liquid refractive index and the output power was finally obtained.Thus the liquid refractive index sensor can be realized based on this relation.Compared with other detection methods,the application of photonic crystal has the advantage of smaller size,wider detection range,easier integration with other laser devices,independence from electromagnetic environment,etc.