表面等离子激元脉冲整流产生太赫兹电动势

Analysis on SPP pulse rectifier producing THz electromotive force

为了深入地研究表面等离子（Surface Plasmon,SP）在传播方向上的太赫兹（THz）电动势,采用了在纳米线结构上对表面等离子激元（Surface Plasmon Polariton,SPP）的脉冲中电子进行整流的方法,分析了SP感应引力的整流作用,讨论了SPP横向模式在长脉冲和短脉冲情况下的电动势模型。研究结果表明,脉冲整流会产生一个幅值较大的电动势,该电动势可达10 V。由于受纳米等离子的限制,在放大过程几乎是非共振的,考虑强纳米等离子限制和纵向SPP波局域条件下,整流作用在金属表面会产生更高的局域THz电场ER,其最大强度EmR=105~106V/cm。整流后SPP脉冲表现为快速,THz场频率,带宽5~20 THz的特性。SPP脉冲中THz电动势的分析对纳米级飞秒光学场的探测,半导体设备的纳米等离子激元耦合,以及非线性THz光谱研究都具有重要意义。

To further study THz electromotive force（EMF） of the surface plasma（SP） in the direction propagation,the external force on electron of（SPP） pulse for rectification on the nanowire structure was introduced,and the traction rectifier role the surface plasmon was analyzed.In addition,theoretical model of SPP transverse mode was discussed in the condition of long pulse and short pulse.Results of the study show that the surface plasmon rectifier will produce a large amplitude electromotive force of 10 V,otherwise,because of the restrictions of nanoplasma,the plasma rectifier is almost the nonresonant amplification,which is characterized by rapid surface plasma rectifier,THz frequency,and bandwidth up to 5-20 THz.In terms of strong limitation of nanoplasma and longitudinal SPP wave localization,SPP rectifier will produce a higher local THz electric field on the metal surface with intensity of 105-106 V/cm.It is significant in detection of femtosecond optical field on nanoscale,nanoplasma polarization couple semiconductor equipment and nonlinear spectroscopy research.