中远红外波段周期凹槽金属表面的等离子体激元  

Surface plasmon polaritons on metal surfaces corrugated by periodic grooves in mid-far infrared range

作　　者：朱方明[1] 李军[1] 胡克用[2] ZHU Fangming;LI Jun;HU Keyong(School of Information Science and Engineering,Hangzhou Normal University,Hangzhou 311121,China;Qianjiang College,Hangzhou Normal University,Hangzhou 310018,China)

机构地区：[1]杭州师范大学信息科学与工程学院,浙江杭州311121 [2]杭州师范大学钱江学院,浙江杭州310018

出　　处：《量子电子学报》2020年第1期110-117,共8页Chinese Journal of Quantum Electronics

基　　金：浙江省自然科学基金,LY17F010010,LY17E070004。

摘　　要：对中远红外波段周期凹槽金属表面结构上传播的表面等离子体激元(SPPs)进行了研究,结果表明金属表面刻周期凹槽可以显著降低人工SPPs的渐近频率,并能提高金属表面对电磁场的约束能力.进一步研究了该波段金属的吸收损耗对人工SPPs(SSPPs)特性的影响,结果显示基于刻槽周期表面结构,不仅可以获得场的亚波长约束,还可以实现长距离传输.通过对电磁波沿该表面结构传输特性的模拟,验证了表面结构所支持的SSPPs的导波能力.该表面结构对设计和开发中远红外波段的新型集成导波器件具有参考意义.Surface plasmon polaritons(SPPs)propagating on metal surfaces corrugated with periodic grooves are investigated in the mid-far infrared band.Results show that the structured surface can significantly reduce the asymptotic frequency and improve the field confinement of SPPs propagating on it.The influence of the metal absorption loss on the performance of spoof SPPs(SSPPs)is also studied at the same frequency range.It is shown that sub-wavelength field confinement and long-distance propagation can be obtained simultaneously for SSPPs on metal surface corrugated with periodic grooves.The guiding ability of SSPPs supported by the structured surface is further verified by simulating the transmission of electromagnetic waves along it.The proposed surface structure may lead to the design and development of new integrated guided wave devices in mid-far infrared band.

关 键 词：波导光学 表面等离子体激元 中远红外波段 波导 亚波长约束 

分 类 号：TN256[电子电信—物理电子学]