非线性左手材料中的背向参量放大  

Bidirectional parametric amplification in nonlinear left-handed metamaterials

作　　者：陈亮[1] 梁昌洪[1] 朱诚[1] 

机构地区：[1]西安电子科技大学天线与微波技术国家重点实验室,陕西西安710071

出　　处：《电波科学学报》2009年第2期254-258,共5页Chinese Journal of Radio Science

基　　金：国家自然科学基金资助(No:60601028)

摘　　要：基于电磁场理论,推导了非线性左手材料中的差频耦合波方程,以及相位匹配条件下介质内信号波与闲频波放大过程和场分布。发现有限厚度的非线性左手介质,可补偿损耗的影响,能够得到比右手介质更大的信号波和闲频波能量输出。提出非线性左手背向参量振荡器,在一定的泵浦条件下,不需要外加谐振腔也可以产生振荡。这为非线性左手材料在参量放大器中的应用奠定了理论基础。Based on the electromagnetic theory, difference-frequency couple-mode equations of nonlinear left-handed metamaterials （LHM） are studied. Energy amplification process and spatial distribution of signal field and idler field under phasematching condition are investigated. It is shown that in a finite thickness metamate- rial slab, losses can be compensated by bidirectional parametric amplification, and more output power of signal wave and difference-frequency wave than a RHM slab with the same thickness can be obtained. Under some definite pump conditions, nonlinear LHM bidirectional parametric oscillator can generate oscillations without an outlaying cavity. This work provides a theoretical basis to the applications of nonlinear LHM in the parametric amplifiers.

关 键 词：左手材料 非线性效应 背向 参量放大 

分 类 号：TM15[电气工程—电工理论与新技术]