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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.
The field enhancement and ultra-fast time-domain response of the coupled core-shell bimetallic nanoparticle antenna are investigated. In the application of the low-period laser, such as the ultrafast response detection element in surface plasmon metal nanodevices, The metal antenna demonstrates the ultra-wideband resonance spectrum and the ability to control localized surface plasmon enhancement.The dimer, trimer, and heptamer were studied and the trimer Ag / Au core-shell structure was found to exhibit extremely high Of the field enhancement, the field amplitude enhancement factor of more than 120, and in the 5fs time field amplitude rapidly decay of 30, maintaining an ultrafast optical response characteristics of the structure of the surface plasmon enhancement effect of high Subharmonic, for the production of ultra-fast attosecond pulse has the potential of important application value.