双金属纳米天线在少周期激光中的宽带超快电磁响应

内容简介：研究了耦合的核壳双金属纳米粒子天线的光场增强与超快时域响应.在少周期激光的应用中,如表面等离激元金属纳米器件中的超快响应探测元件,这种双金属天线展示了超宽带共振频谱及控制局域表面等离激元增强的能力.研究了二聚体、三聚体以及七聚体,并且发现三聚体Ag/Au核壳结构显现了极高的场增强能力,其场振幅增强因子超过了120,并在5 fs的时间内场振幅迅速衰减为30,保持了超快的光学响应特性.利用该结构的表面等离激元增强效应产生高次谐波,对于产生超快阿秒脉冲有着潜在的重要应用价值.

Abstract：We explore the field enhancement and temporal response of coupled bi-metal Ag/Au core-shell nanoparticle antennas.The bimetal antennas exhibit ultra-broadband resonances and allow exploiting the local field enhancement for few-cycle laser applications such as elements with an ultrafast response in nanoplasmonic device.We study dimer,trimer and heptamer arrangements and find that the Ag/Au core-shell trimer shows that a very high enhancement factor with an amplitude exceeds 120,but still facilitates an ultrafast response.Such systems may be ideal for the generation of attosecond light pulses based on high harmonic generation by employing nanoplasmonic field enhancement.

作者：杨盈莹, 张永亮, 赵震声, 段宣明,

关键词：纳米光学天线, 双金属球壳结构, 少周期激光脉冲, 表面等离激元,