两耦合半无限超晶格中的局域界面声子-极化激元  

Localized interface phonon polaritons in two coupled semi-infinite superlattices

作　　者：龚志强[1] 贺梦冬[1] 

机构地区：[1]中南林业科技大学理学院,株洲412006

出　　处：《物理学报》2007年第11期6600-6607,共8页Acta Physica Sinica

摘　　要：采用转移矩阵方法,研究了含结构缺陷层的两耦合半无限超晶格(GaAs/AlAs)中的局域界面声子-极化激元模性质.研究发现,含不同介电特性的缺陷超晶格结构中的局域界面声子-极化激元模在剩余射线区[ωTO,ωLO]的分布情况与数量存在不同,而且反对称模表现出不同的特征.文中着重研究了缺陷层介电常数与角频率无关的缺陷超晶格,发现该结构中的局域界面声子-极化激元模对组分层的排列顺序与厚度、缺陷层的厚度以及横向波数有着不同程度的依赖.　Using a transfer matrix method,we study the characteristics of the localized interface phonon polariton modes in two coupled superlattices（SL＇s）with a defect layer.Comparing different structure defects of SL where the dielectric characteristics of defect layers are different,we find that there are certain differences in the distribution and number of the localized interface phonon polariton modes in the Reststrahlen regions [ω TO,ω LO] and there are different characteristics for anti-symmetric modes in the above structures.The structuraly defective SL of which the dielectric constant of defect layer is independent of frequency was emphatically investigated.We found that the localized interface phonon polariton modes in such structure are sensitive to the thicknesses and order of the constituent layers,the thickness of the defect layer as well as the transverse wavenumber q∥.

关 键 词：声子-极化激元 局域模 两耦合半无限超晶格 转移矩阵 

分 类 号：O481[理学—固体物理]