蜂窝晶格光子晶体偏振分束器的设计

Design of Polarization Beam Splitter Based on Honeycomb-lattice Photonic Crystal

提出一种基于二维蜂窝晶格光子晶体介质柱型微环偏振分束器,并运用二维时域有限差分方法数值分析了该环形谐振腔外围周期和环区局部折射率调制对下路效率、品质因子以及下路波长等参量的影响。结果表明,对于TM偏振光,垂直外围周期d对波长的影响比较明显;对于TE偏振光,水平外围周期L对其下路效率和品质因子的影响比较明显,而d对下路波长的影响比较明显。同时,当环区局部折射率从3.39变化到3.46时,对于TM/TE偏振光,其波长位置基本保持一致。

A new polarization beam splitter （PBS） is proposed based on two-dimensional photonic crystal ring resonator composed of honeycomb-lattice cylindrical silicon rods in air. The physical parameters like dropping wavelength, dropping efficiency and spectral quality factor （Q） affected by the change of surrounding periods and localized refractive index of in- ner ring were numerically analyzed by using a two-dimensional finite-difference time-domain technique. The results show that the dropping wavelength of TM polarized beam can be greatly influenced by the vertically surrounding period d. On the other hand, the dropping efficiency and spectral quality factor of TE one is sensitive to the change of horizontally surround- ing period L while the dropping wavelength is sensitive to d. When the localized index of ring varied from 3.39 to 3.46, the dropping wavelength can keep almost the same for both TM and TE polarized beams.