薄膜G-T腔结构的空间波分解复用器设计

Wavelength demultiplexer design using the spatial dispersion of Gires-Tournois thin film structure

结合全通滤波器的设计方法，利用一维薄膜光予晶体的超棱镜效应，设计了一种G—T腔（Gires—Tournois腔）型薄膜空间波分解复用器，可在特定波段得到线性大空间色散，实现对入射光束的空间解复用作用。文中针对850hm波段进行了具体设计，以低折射率材料为腔材料，采用SubH（LH）M1[（LL）C1]H（IH）M2[（LL）C2]H（LH）M3E（LL）C3]…的膜系结构，在844-856nm的范围内得到约19．3μm的线性空间色散位移。

By the method of designing all-pass filter structures, a new kind of wavelength demultiplexer based on multi-cavity Gires-Tournois cavity is designed and implemented with thin film stacks in this paper. Because of its superprism effect ,as one-dimensional photonic crystal ,this structure exhibits high spatial dispersion,which can be designed to be linear. The specific design is performed at 850nm,with low refractive index as cavity material. At the end of our design,a linear spatial dispersive shift of about 19. 3μm is obtained at 844-856nm, using the layers generic formula Sub H （LH）M1 [（LL）C1]H（LH）M2[（LL）C2] H（LH）M3[（LL）C3]....