四类畴压电压磁超晶格的电磁波单方向透射  

Unidirectional Transmission Investigations of Electromagnetic Waves in Piezoelectric-Piezomagnetic Superlattices with Four Types of Domains in a Unit Cell

作　　者：唐政华[1] 雷大军[1] 黄健全[1] 邱枫[1] 蒋纯志[1] 姚敏[1] 杨丽萍[1] 

机构地区：[1]湘南学院电子信息与电气工程学院,郴州423000

出　　处：《华南师范大学学报（自然科学版）》2016年第4期26-30,共5页Journal of South China Normal University(Natural Science Edition)

基　　金：湖南省高校科技创新团队项目(湘教通[2014]207号);湖南省教育厅项目(14C1060);郴州市科技计划项目(CZ2014042)

摘　　要：压电压磁超晶格中畴排列方式的不同导致其性质发生改变.文中基于四类畴压电压磁超晶格结构,将1个周期内畴的排布方式分为(+P,-P,+M,-M)、(+P,-P,+P,+M)和(+P,+M,-M,+M)3种.对于(+P,-P,+P,-M)结构,珚ω=2.719附近存在1个单方向频率通道,相对带宽约为3.26%.对于(+P,-P,+P,+M)结构,珚ω=2.374附近通道2的最大群速度指数可达ng=69 695.1.电磁波通过长为1 cm的超晶格的延迟时间约为2.32μs.对于(+P,+M,-M,+M)结构,通过外加电场反转极化可实现快波和慢波的切换,群速度指数的改变量可达52.5,可用于构造单方向电磁波导和群速度延迟器件.The different arrangements of domains of piezoelectric-piezomagnetic superlattices lead to different properties. Piezoelectric-piezomagnetic superlattiees with four types of domains in a unit cell （FPPS） are studied in detail in this work; the arrangements of a period are divided into 3 types, that is （＋P,-P, ＋M,-M） , （＋P,-P, ＋P, ＋M） and （ ＋P, ＋M, -M, ＋M）. For the FPPS with （ ＋P, -P, ＋M, -M） domains, there is a frequency channel al- lowing one-way transmission of forward electromagnetic waves, and the relative bandwidth is about 3.26%. For the FPPS with （＋P,-P,＋P,＋M）, the maximum group velocity index ng reaches 69 695.1 in the frequency channel around ω^- = 2. 374. The delay time is about 2.32 μs when electromagnetic waves pass through the FPPS with the total length of 1 cm. For the FPPS with （＋P,＋M,-M, ＋M） , the fast and slow waves can be switched when the electric field is applied to invert the polarization, and the change of group velocity index can reach 52.5. Thus, it is suggested that the FPPS can be applied to construct the one-way waveguide and slow wave delay devices.

关 键 词：四类畴压电压磁超晶格 耦合极化激元带结构 单方向频率通道 群速度指数 

分 类 号：O482.3[理学—固体物理]