Y型光子晶体偏振光分束器

Polarization beam splitter for Y type photonic crystal

基于偏振模式不同的光波在二维光子晶体中的传播特性不同,设计出一个支路半径相同的Y型二维光子晶体偏振光分束器.通过时域有限差分法对该分束器进行数值计算与模拟分析.结果表明,该分束器能够实现TE模和TM模平行、高效分束.当波长为1.55μm的高斯脉冲入射时,TE模透射率可达97%,TM模透射率可达93.5%,且该结构尺寸仅有6.3μm×6.8μm.这些特性使其在未来的集成光路中具有很好的应用前景.

The design and simulation of polarization beam splitter （PBS） for Y type two-dimensional photonic crystal with the same beam splitting radius are presented. It is based on the different properties of the light waves with different polarization modes propagating in the two-dimensional photonic crystal. The function of the PBS were numerically simu- lated and analyzed using the finite difference time domain （FDTD） method. It is shown that parallel splitting with high efficiency for TE and TM modes can be achieved. The transmission probability can reach over 97% for TE mode and over 93.5% for TM mode for a Gaussian pulse light with a wavelength of 1.55 μm. The size of the splitter is only 6.3 μm× 6.8 μm. Owing to these excellent features, the PBS is a promising candidate in the future photonic integrated circuits.