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混合准周期异质结构的带隙补偿与展宽
引用本文:邹俊辉,张娟. 混合准周期异质结构的带隙补偿与展宽[J]. 物理学报, 2016, 65(1): 14214-014214. DOI: 10.7498/aps.65.014214
作者姓名:邹俊辉  张娟
作者单位:上海大学通信与信息工程学院, 特种光纤与光接入网省部共建教育部重点实验室, 上海 200072
基金项目:上海市科委重点项目(批准号: 11jc1413300)、上海市教委科研创新项目(批准号: 15ZZ045)和上海市重点学科(批准号: S30108)资助的课题.
摘    要:基于一维光子晶体异质结构的多帯隙交叠补偿思想,提出了一种新颖的混合准周期级联结构,用于扩大全方位光子带隙.该全方位反射器结构由Fibonacci准周期结构和Thue-Morse准周期结构级联构成,研究表明,相比单种准周期结构,其全方位光子带隙宽度有显著提高.系统研究了结构参数(如周期数、阶数、介质折射率和厚度)对该结构光子带隙的影响,通过与周期结构带隙特性的比较,分析了准周期结构易于实现多带隙交叠的原因,为更复杂带隙结构的补偿和展宽奠定了设计基础.

关 键 词:光子晶体  准周期  异质结构  光子带隙
收稿时间:2015-07-28

Photonic bandgap comp ensation and extension for hybrid quasip erio dic heterostructures
Zou Jun-Hui,Zhang Juan. Photonic bandgap comp ensation and extension for hybrid quasip erio dic heterostructures[J]. Acta Physica Sinica, 2016, 65(1): 14214-014214. DOI: 10.7498/aps.65.014214
Authors:Zou Jun-Hui  Zhang Juan
Affiliation:Key Laboratory of Specialty Fiber Optics and Optical Access Networks, School of Communication and Information Engineering, Shanghai University, Shanghai 200072, China
Abstract:Based on the idea of multiple photonic bandgap (PBG) overlapping for a one-dimensional photonic crystal heterostructure, a novel hybrid quasiperiodic heterostructure is proposed to enlarge the omnidirectional photonic bandgap (OPBG). The heterostructure is formed by combining Fibonacci and Thue-Morse quasiperiodic structure. The results show that the OPBG of the heterostructure is enlarged obviously, which increases about three times compared with that of Fibonacci quasiperiodic structure, and twelve times compared with that of Thue-Morse quasiperiodic structure. The influences of structural parameters, such as period number and generation number, on PBGs of Fibonacci and Thue-Morse quasiperiodic structure are studied respectively. The results show that the parameters have little effects on PBG widths of the two quasiperiodic structures. The influences of the refractive indexes and thickness values of the high and low refractive index materials on OPBG of the heterostructure are also investigated. The results show that the OPBG of the heterostructure can be further broadened by increasing the refractive index ratios and thickness values of the high and low refractive index materials. The reason why the quasiperiodic structure can easily realize the multiple band gap overlapping is analyzed by comparing the bandgap properties of periodic structure. The number of PBGs of the quasiperiodic structure in the same wavelength range is more than that of the periodic structure. Moreover, with the increase of generation number of the quasiperiodic structure, due to the occurrence of PBG split, the number of PBGs increases obviously, and each PBG width is less than that of the periodic structure. Owing to this kind of PBG characteristic of the quasiperiodic structure, the heterostructure formed by cascading the two quasiperiodic structures is more prone to realizing the multiple PBG overlapping than other heterostructures, thus more easily achieving the expansion of OPBG. These results lay the design foundation for the compensation and broadening of the more complex bandgap structure.
Keywords:photonic crystal  quasiperiodic  heterostructure  photonic bandgap
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