双层金属环形阵列的太赫兹表面等离子体研究  

Research on surface plasmon modes for terahertz transmission through double-layer metal loop arrays

作　　者：夏松[1] 杨冬晓[1] 

机构地区：[1]浙江大学信息与电子工程学系,浙江杭州310027

出　　处：《激光与红外》2014年第8期927-932,共6页Laser & Infrared

基　　金：国家自然科学基金(No.60671006;No.60971059)资助

摘　　要：研究了太赫兹波垂直通过具有周期性亚波长环形空气槽阵列的金属-介质-金属三层结构的透射谱特性,以及与表面等离子体谐振的关系。共振模式电场分布与色散曲线分别表明:表面等离子体具有束缚性,表面电磁波的传输机制与能量流动过程,透射谱的两个共振峰与传播性的表面等离子体模式、局域化的表面等离子体模式及其耦合有关。改变结构的几何参数,其共振峰变化趋势进一步印证了以上观点,并且空气环中激发的准波导效应也影响了太赫兹波的传输。When a metal-dielectric-metal structure is illuminated by vertical incidence of terahertz wave,the character-istic of transmission spectra and the relationship with surface plasmon resonance are studied.The electric field distri-butions of the resonance modes in transmission spectra confirms the confinement of surface plasmon and the propaga-tion mechanism of surface electromagnetic waves and process of energy flow.Based on dispersion curve of the struc-ture,propagating surface plasmon and localized surface plasmon principally dominated the lower and higher reso-nances,respectively.By changing the parameters of the structure,further studies show that besides the two SP modes mentioned above,coupling of SP modes as well as quasi-rectangular waveguide effect generated in the air loop signifi-cantly modifies the terahertz transmission.

关 键 词：太赫兹波 表面等离子体 共振透射 周期性阵列 

分 类 号：O539[理学—等离子体物理]