在完整的二维三角晶格硅光子晶体中，引入线缺陷和非线性聚合物材料的点缺陷，利用线缺陷模和点缺陷模的耦合作用和非线性聚合物材料的三阶非线性克尔效应，提出了一种基于二维光子晶体的光控分光比可调Y型太赫兹波分束器。采用平面波展开法（PWM）和时域有限差分法（FDTD），对分光比可调的太赫兹波分束器性能进行了研究。研究结果表明，通过改变控制光的光强，可实现两输出端口分光比可调的Y型太赫兹波分束器。此分束器可实现特定波长的太赫兹波分光，透射率达到98%以上，附加损耗低于0.087 dB，响应时间达到ps量级。该分光比可调的分束器将在未来太赫兹波通信中具有广阔的应用前景。

Light-control splitting ratio tunable Y-type Terahertz waves to beam splitter based on two-dimensional photonic crystal is proposed. In this scenario， the feature that coupling with line defects and the point defects of nonlinear polymer materials which have the third-order nonlinear Kerr effect is utilized. The performance of Terahertz waves splitter with tunable splitting ratio is studied by Plane Wave Method （PWM） and Finite-Difference Time-Domain （FDTD）.The research results show that the Y-type Terahertz wave splitter with tunable splitting ratio of two output ports by changing the light intensity of the control light can be realized.This beam splitter which the transmittance reaches over 98% can achieve Terahertz waves splitting with a specific wavelength. At the same time， the additional loss is less than 0.087dB and the response time reaches the order for ps.The splitter with tunable splitting ratio will have broad application prospects in future Terahertz wave communication.