Herein, we presented a novel design of polarization beam splitter (PBS) based on the integration of heterostructure 2D- Photonic crystals (PhCs). Two PhC structures, namely PhC-type 1 and PhC-type 2, with different transmission characteristics are proposed. The first type of PhC is composed of a 2D-periodic array of circular air holes embedded in silicon substrate which facilitates the propagation of self-collimated TE and TM-polarized light. The second type of PhC consists of a 2D-periodic array of square-shaped air holes embedded in silicon substrate which carry a photonic bandgap (PBG) for TE-polarized light whereas TM-polarized light propagates unaffected by diffraction. When PhC-type 2 structure is arranged at 45° on both sides of the PhC-type 1 structure, this combination leads to the formation of PBS with a polarization extinction ratio (PER) as high as 30.7 dB. Furthermore, the same structure can be used to steer the TE-polarized light at 180° in a small footprint. Additionally, the heterostructure PhC can be used for TM-polarization maintain devices.

在这里，我们提出了一种基于异质结构二维光子晶体（PhCs）集成的偏振分束器（PBS）的新颖设计。提出了两种具有不同传输特性的PhC结构，即PhC-type 1和PhC-type 2。第一种PhC由嵌入硅基板中的圆形气孔的2D周期阵列组成，该阵列便于自准直TE和TM偏振光的传播。第二类PhC由嵌入硅衬底的方形气孔的2D周期阵列组成，该气孔携带有TE偏振光的光子带隙（PBG），而TM偏振光的传播不受衍射影响。当PhC 2型结构在PhC 1型结构的两侧以45°排列时，这种结合导致形成具有高达30.7 dB的偏振消光比（PER）的PBS。此外，可以使用相同的结构在较小的占地面积内将TE偏振光转向180°。此外，异质结构PhC可用于TM极化保持器件。