周期性层状铁氧体-电介质复合材料中导模模式的有效负折射率  

Negative effective refraction index in guided wave mode for periodic layered ferrite-dielectric/metallic film composites

作　　者：赵天恩[1] 伍瑞新[1] 杨帆[1] 陈平[1] 

机构地区：[1]南京大学电子科学与工程系,南京210093

出　　处：《物理学报》2006年第1期179-183,共5页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:60471020);国家重点基础研究发展计划(批准号:2004CB719805)资助的课题~~

摘　　要：运用等效传输线法研究了周期性层状铁氧体-电介质/金属复合材料导模模式的有效折射率.通过对复合材料导模模式的色散特性和有效折射率的分析和计算,发现负折射率只能出现在TE模式激励下的某一频带内.在负折射率频带内的电磁损耗与复合材料中介电材料的性质密切相关,减小介电损耗可以有效降低复合材料的损耗,但过分小的介电损耗则会导致负折射率的消失.We have studied the effective refraction index of the guided wave mode in periodic layered ferrite-dieleetric/metal film composites. Using the equivalent transmission line approach we have analyzed and calculated the dispersion characters and then the effective refraction index of the composites. We have found that the effective refraction index of the composites will be negative within a certain frequencies only when the wave is in TE mode. The loss of the composite is closely related to the dielectric layers, which can be effectively reduced by decrease the dielectric loss. However, too small dielectric loss results in disappearing of the negative refraction index.

关 键 词：负折射率 导模模式 等效传输线法 

分 类 号：TB331[一般工业技术—材料科学与工程]