激光与光电子学进展, 2020, 57 (1): 011402, 网络出版: 2020-01-03
液晶可调谐VCSEL中高对比光栅结构的设计 下载: 1691次
High-Contrast Grating Structure Design for Liquid Crystal Tunable Vertical-Cavity Surface-Emitting Lasers
激光器 可调谐垂直腔面发射半导体激光器 高对比光栅 液晶 高反射率 耦合波理论 lasers tunable vertical-cavity surface-emitting lasers high contrast grating liquid crystal high reflectivity coupled-wave analysis
摘要
基于严格耦合波理论设计了一种以液晶为低折射率材料的Si-SiO2复合高对比光栅,该光栅适合用于实现液晶可调谐功能的垂直腔面发射半导体激光器件。当940 nm 的TM偏振光入射时,通过优化参数可得到宽带(Δλ=256 nm)高反射率(R>99%)且具有偏振稳定性的光栅结构,满足垂直腔面发射半导体激光器顶部腔面反射镜要求。液晶折射率的改变不会影响光栅的性能,未来有望将高对比光栅或混合光栅与液晶可调谐垂直腔面发射半导体激光器相结合,实现可调谐半导体激光器。
Abstract
In this paper, the rigorous coupled-wave analysis theory is used to simulate a hybrid Si/SiO2 high-contrast grating using a liquid crystal as a low refractive index material, which is suitable for liquid crystal tunable vertical-cavity surface-emitting lasers (VCSEL). Using 940-nm TM polarized incident light, the parameters of the grating structure can be optimized to obtain broadband (Δλ=256 nm), high reflectivity (R>99%), and polarization-stabilized characteristics that satisfy the VCSEL top mirror requirements. Changes in the refractive index of the liquid crystal do not affect the quality of the grating. Liquid crystal tunable VCSELs are expected to be combined with different high-contrast gratings and hybrid gratings in the future.
郑舟, 邹永刚, 石琳琳, 房俊宇, 王海珠, 范杰, 崔超, 徐莉, 马晓辉. 液晶可调谐VCSEL中高对比光栅结构的设计[J]. 激光与光电子学进展, 2020, 57(1): 011402. Zhou Zheng, Yonggang Zou, Linlin Shi, Junyu Fang, Haizhu Wang, Jie Fan, Chao Cui, Li Xu, Xiaohui Ma. High-Contrast Grating Structure Design for Liquid Crystal Tunable Vertical-Cavity Surface-Emitting Lasers[J]. Laser & Optoelectronics Progress, 2020, 57(1): 011402.