平面波导窄带干涉滤波方法的研究

基于多层膜干涉滤波的理论提出了一种在平面波导通道中进行干涉滤波的新方法,这种方法可以使窄带滤波器完全集成在波导通道中,实际上就是波导通道的一部分。根据这种方法优化设计了两种波导干涉滤波器单元器件,并且以27层开放式波导干涉滤波器双腔结构为例,计算了垂直入射时的输出光谱和单腔结构滤波后的场强分布。最后,分别分析了滤波器的波导膜的材料、厚度和信号入射角度对输出光谱的峰值透过率、通带半宽度、消光比以及有效区域的影响,提出了进一步优化的方向。这种在平面波导通道中直接进行窄带滤波的技术将在光通信、光传感和光信息处理等很多方面有广泛的应用。

Investigation on interference filter within planar waveguides

A new narrow-band filtering method based on the theory of multi-layer thin-film optical interference is proposed. A multi-layer interference filter is integrated within a waveguide channel completely in this scheme, so it is actually a part of the waveguide. Two different structures of waveguide interference filters are investigated and the output spectrum of a two-cavity structure with 27 periodic layers and the field distributions of a single-cavity structure are calculated. Finally, by changing the materials and structure, the influence of refractive index, thickness of waveguide thin-film layer and incident angle on peak transmittance, peak width at half-maximum, extinction ratio and effective area are analyzed, and the direction for further development is given too.