物理学报Issue(1)：014214-1-014214-9,9.DOI:10.7498/aps.65.014214
混合准周期异质结构的带隙补偿与展宽∗
Photonic bandgap comp ensation and extension for hybrid quasip erio dic heterostructures
摘要
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.关键词
光子晶体/准周期/异质结构/光子带隙Key words
photonic crystal/quasiperiodic/heterostructure/photonic bandgap引用本文复制引用
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,(1):014214-1-014214-9,9.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.* Project supported by the Key Program of the Science and Technology Commission of Shanghai, China (Grant No.11jc1413300), the Innovation Program of Shanghai Municipal Education Commission, China (Grant No.15ZZ045), and the Shanghai Leading Academic Discipline Project, China (Grant No. S30108) （批准号:11jc1413300）
