利用高对比度光栅实现光束大角度偏转  

Large angle deflection of beam using high contrast grating

作　　者：王超素 江孝伟 WANG Chaosu;JIANG Xiaowei(College of Information Engineering, Quzhou College of Technology, Quzhou 324000, China;Optoelectronics Technology Laboratory of Ministry of Education, Beijing University of Technology, Beijing 100124, China)

机构地区：[1]衢州职业技术学院信息工程学院,衢州324000 [2]北京工业大学光电子技术教育部重点实验室,北京100124

出　　处：《激光技术》2021年第4期485-491,共7页Laser Technology

基　　金：国家自然科学基金资助项目(61575008,61650404);江西省自然科学基金资助项目(20171BAB202037);江西省教育厅科技项目(GJJ170819);衢州市科技计划资助项目(2019K20)。

摘　　要：为了分析高折射率对比度光栅(HCG)参量和入射波长对光束偏转角的影响,采用严格耦合波法设计了透射光束可偏转非周期三角HCG,并通过时域有限差分法证明了所设计的非周期三角HCG可实现30.3°的透射光束偏转。结果表明,当低折射率介质材料折射率从1增加到1.4时,透射光束偏转角可实现11°的调谐;当入射波长从波长1.5μm增加到1.6μm时,该非周期三角HCG可实现3.527°的透射光束偏转角调谐。这一研究结果可对将来制备高性能光束偏转光栅提供理论指导。In order to analyze the influence of high contrast grating(HCG)parameters and incident wavelength on beam deflection angle,the rigorous coupled wave method was used to design a deflectable non-periodic triangular HCG,and it is proved that 30.3°beam deflection can be achieved in the designed non-periodic triangular HCG by the finite-difference time-domain(FDTD).At the same time,it is found that when the refractive index of the low refractive index material increases from 1 to 1.4,the deflection angle of the transmission beam can achieve 11°tuning,and when the incident wavelength increases from 1.5μm to 1.6μm,the aperiodic triangular HCG can achieve 3.527°transmission beam deflection angle tuning.The results can provide theoretical guidance for the fabrication of high-performance beam deflection gratings in the future.

关 键 词：光栅 光束偏转 透射光 非周期 

分 类 号：TN253[电子电信—物理电子学]