基于非周期高折射率差亚波长光栅的光功分器（英文）  

Novel Optical Power Splitter Based on Nonperiodic Subwavelength High-Index-Contrast Grating

作　　者：毛敏[1] 黄永清[1] 房文静[1] 段晓峰[1] 刘凯[1] 任晓敏[1] 

机构地区：[1]北京邮电大学信息光子学与光通信国家重点实验室,北京100876

出　　处：《激光与光电子学进展》2016年第1期61-65,共5页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(62174044);北京自然科学基金(4132069)

摘　　要：提出了一种新的基于非周期高折射率差亚波长光栅（HCG）的光功分器（OPS）。该光功分器在实现光功率均分的同时保持高反射率。为实现上述功分器，通过严格耦合波理论分析（RCWA）周期性亚波长光栅在不同的周期和占空比下的反射率和相位分布，从而挑选合理的参数用于设计非周期亚波长光栅以获得特定的反射相移。最后借助于有限元法（FEM）进行数值分析，经计算光功分器的插入损耗为3.27 dB,波长变化范围为1.50~1.60 μm，且很容易与半导体器件集成。A novel optical power splitter （OPS） based on a nonperiodic subwavelength high-index-contrast grating （HCG） is proposed. The OPS can split the reflected light into two beams while maintaining a high reflectivity. In order to achieve a specific phase-shift distribution for the application mentioned above, a rigorous coupled-wave analysis （RCWA） is used to calculate the reflectivity and phase shift of a periodic subwavelength HCG while changing the grating period and duty cycle to obtain the proper structural parameters of the HCG. The properties of the two-port OPS are numerically studied with a finite element method （FEM）, which exhibits a 3.27 dB insertion loss and a wavelength varying from 1.50 to 1.60 μm. The presented OPS can be easily integrated with a semiconductor device.

关 键 词：光学器件 光功分器 高折射率差光栅 亚波长 相移 

分 类 号：O436.1[机械工程—光学工程]