宽光谱宽视角亚波长金属偏振分束器的研究  

Polarizing Beam Splitters Based on Subwavelength Metal Grating with wide Spectrum and Wide Angle

作　　者：季淑英[1] 孔伟金[1] 李娜[1] 车卫康 司维[1] 徐志恒[1] 

机构地区：[1]青岛大学物理科学学院,青岛266071

出　　处：《青岛大学学报（自然科学版）》2017年第1期21-23,28,共4页Journal of Qingdao University(Natural Science Edition)

基　　金：国家自然科学基金项目(批准号:11274188)资助

摘　　要：基于严格耦合波分析设计了一种亚波长金属偏振分束光栅,通过遗传算法优化出最佳光栅结构。该光栅在1429<λ<1700nm波段,TM波的0级透射率和TE波的0级反射率优于90%,入射角-27.5°<θ<27.5°时,光栅透射和反射消光比都大于20dB,达到了宽光谱、宽视角的要求。数值分析表明光栅对周期、槽深具有优良的工艺容差。The polarizing beam splitting performance of subwavelength metal grating was designed using the rigorous couple-wave theory and the parameters was optimized using genetic algorithm.The transmission and reflection diffraction efficiency of 0order can be more than 90% when the incident wavelength was varied in the range from 1429 nm to 1700 nm,the transmission and reflection extinction ratios were better than 20 dB when the incident angle is in the range from-27.5to 27.5,which met the expectations for wide spectrum,wide angle.Numerical results showed that the designed grating has good manufacture tolerance to period and groove depth.

关 键 词：亚波长光栅 严格耦合波分析 遗传算法 偏振分束 

分 类 号：O436.3[机械工程—光学工程]