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在只有TE模光子带隙空气孔三角晶格光子晶体研究的基础上,设计出一种全新的、结构紧凑的定向耦合光子晶体偏振光分束器。根据波导间相互耦合与自映像原理,采用时域有限差分法分析了该器件的光传输特性。研究结果表明:由于导光机制不同,TE模和TM模可通过不同的相干长度分离;两种偏振光在波长1.55μm附近透射率都达到95%以上;该器件的尺寸比传统偏振光分束器短。这些优异性能在光子晶体集成电路中有极大的应用价值。
Based on the study of TE mode photonic bandgap air hole triangular lattice photonic crystals, a new and compact structure of directional coupled photonic crystal polarization beam splitter is designed. According to the mutual coupling and self-mapping principle of waveguides, the finite-difference time-domain method was used to analyze the optical transmission characteristics of the device. The results show that the TE mode and the TM mode can be separated by different coherence lengths due to the different light guiding mechanisms. The transmittance of the two polarized lights reaches more than 95% at the wavelength of 1.55 μm. The size of the device is smaller than that of the traditional polarized beam splitter Short device. These excellent performance in the photonic crystal integrated circuit has great application value.