基于1×4光子晶体波导分束器的特性研究

Characteristics of beam splitter based on 1×4 photonic crystal waveguide

光子晶体波导分束器是集成光学电路的重要组成元件。设计一种线缺陷1×4光子晶体分束器,用时域有限差分法研究其特性。实验结果表明:输出端的透射传输特性随入射光的波长和分支的几何形状有关,并且入射波分别相等地流入4个输出端口。为了减少1×4分束器在3个Y型分支区的反射,通过调节分支区的可调介质柱的半径R,可使每个输出端口输出较高的透射率。

The beam splitter based on photonic crystal waveguides is taken as an essential component in integrated optical circuits. A linear-defect 1× 4 photonic crystal splitter was designed, and its characteristics were analyzed with the time-domain finite difference method. The experiment results show that the transmission properties at output end is dependent on the wavelength of incident light and the geometric shape of the branch, and the incident wave is divided equally into four output ports. The high transmittance can be obtained at each output port by adjusting the radii of the medium in the branching region to reduce the reflection of the 1 × 4 splitter at the three Y-branching regions.